linux-kernel - memory leak in v9fs_cache_session_get

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Date:   Tue, 21 May 2019 06:39:07 -0700
From:   syzbot <syzbot+3a030a73b6c1e9833815@...kaller.appspotmail.com>
To:     asmadeus@...ewreck.org, ericvh@...il.com,
        linux-kernel@...r.kernel.org, lucho@...kov.net,
        syzkaller-bugs@...glegroups.com,
        v9fs-developer@...ts.sourceforge.net
Subject: memory leak in v9fs_cache_session_get_cookie

Hello,

syzbot found the following crash on:

HEAD commit:    f49aa1de Merge tag 'for-5.2-rc1-tag' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1224e228a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=61dd9e15a761691d
dashboard link: https://syzkaller.appspot.com/bug?extid=3a030a73b6c1e9833815
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ffe1f8a00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=151e66bca00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3a030a73b6c1e9833815@...kaller.appspotmail.com

  fl=222 nc=0 na=1]
BUG: memory leak
unreferenced object 0xffff88811d5b7ce0 (size 32):
   comm "syz-executor234", pid 7220, jiffies 4294945629 (age 16.870s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888114735700 (size 32):
   comm "syz-executor234", pid 7227, jiffies 4294945629 (age 16.870s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7860 (size 32):
   comm "syz-executor234", pid 7225, jiffies 4294945634 (age 16.820s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 33 34 00 00 00 00 00 00  4294945634......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7ce0 (size 32):
   comm "syz-executor234", pid 7220, jiffies 4294945629 (age 17.810s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888114735700 (size 32):
   comm "syz-executor234", pid 7227, jiffies 4294945629 (age 17.810s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7860 (size 32):
   comm "syz-executor234", pid 7225, jiffies 4294945634 (age 17.760s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 33 34 00 00 00 00 00 00  4294945634......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7ce0 (size 32):
   comm "syz-executor234", pid 7220, jiffies 4294945629 (age 18.730s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888114735700 (size 32):
   comm "syz-executor234", pid 7227, jiffies 4294945629 (age 18.730s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7860 (size 32):
   comm "syz-executor234", pid 7225, jiffies 4294945634 (age 18.680s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 33 34 00 00 00 00 00 00  4294945634......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7ce0 (size 32):
   comm "syz-executor234", pid 7220, jiffies 4294945629 (age 20.550s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888114735700 (size 32):
   comm "syz-executor234", pid 7227, jiffies 4294945629 (age 20.550s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7860 (size 32):
   comm "syz-executor234", pid 7225, jiffies 4294945634 (age 20.510s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 33 34 00 00 00 00 00 00  4294945634......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7ce0 (size 32):
   comm "syz-executor234", pid 7220, jiffies 4294945629 (age 21.520s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888114735700 (size 32):
   comm "syz-executor234", pid 7227, jiffies 4294945629 (age 21.520s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7860 (size 32):
   comm "syz-executor234", pid 7225, jiffies 4294945634 (age 21.470s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 33 34 00 00 00 00 00 00  4294945634......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7ce0 (size 32):
   comm "syz-executor234", pid 7220, jiffies 4294945629 (age 23.430s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888114735700 (size 32):
   comm "syz-executor234", pid 7227, jiffies 4294945629 (age 23.430s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 32 39 00 00 00 00 00 00  4294945629......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811d5b7860 (size 32):
   comm "syz-executor234", pid 7225, jiffies 4294945634 (age 23.380s)
   hex dump (first 32 bytes):
     34 32 39 34 39 34 35 36 33 34 00 00 00 00 00 00  4294945634......
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<000000002cabdadb>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<000000002cabdadb>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<000000002cabdadb>] slab_alloc mm/slab.c:3326 [inline]
     [<000000002cabdadb>] kmem_cache_alloc_trace+0x13d/0x280 mm/slab.c:3553
     [<00000000c9696bd2>] kmalloc include/linux/slab.h:547 [inline]
     [<00000000c9696bd2>] v9fs_random_cachetag fs/9p/cache.c:51 [inline]
     [<00000000c9696bd2>] v9fs_cache_session_get_cookie+0xa6/0x100  
fs/9p/cache.c:67
     [<000000009f2e3d4c>] v9fs_session_init+0x5c3/0x880 fs/9p/v9fs.c:485
     [<000000003e76ac4c>] v9fs_mount+0x5e/0x3a0 fs/9p/vfs_super.c:135
     [<00000000de1b2937>] legacy_get_tree+0x27/0x80 fs/fs_context.c:665
     [<000000009d8e25aa>] vfs_get_tree+0x2e/0x120 fs/super.c:1476
     [<0000000012e90ac4>] do_new_mount fs/namespace.c:2790 [inline]
     [<0000000012e90ac4>] do_mount+0x932/0xc50 fs/namespace.c:3110
     [<0000000055e18c39>] ksys_mount+0xab/0x120 fs/namespace.c:3319
     [<000000003fbb869f>] __do_sys_mount fs/namespace.c:3333 [inline]
     [<000000003fbb869f>] __se_sys_mount fs/namespace.c:3330 [inline]
     [<000000003fbb869f>] __x64_sys_mount+0x26/0x30 fs/namespace.c:3330
     [<000000005a440e8e>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301
     [<0000000091465610>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

executing program
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---
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