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Message-ID: <CACT4Y+aGjkmq4cEaQXagd_YqjE4a1HoNgcEzqeNj-g0Hg_hQHw@mail.gmail.com>
Date: Thu, 6 Sep 2018 21:41:37 +0200
From: Dmitry Vyukov <dvyukov@...gle.com>
To: "Theodore Y. Ts'o" <tytso@....edu>,
syzbot <syzbot+0eefc1e06a77d327a056@...kaller.appspotmail.com>,
Andreas Dilger <adilger.kernel@...ger.ca>,
linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
Casey Schaufler <casey@...aufler-ca.com>,
James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
linux-security-module@...r.kernel.org
Subject: Re: possible deadlock in ext4_evict_inode
On Thu, Sep 6, 2018 at 9:38 PM, Theodore Y. Ts'o <tytso@....edu> wrote:
> On Thu, Sep 06, 2018 at 09:41:04AM -0700, syzbot wrote:
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit: b36fdc6853a3 Merge tag 'gpio-v4.19-2' of git://git.kernel...
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=1716bc9e400000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=6c9564cd177daf0c
>> dashboard link: https://syzkaller.appspot.com/bug?extid=0eefc1e06a77d327a056
>> compiler: gcc (GCC) 8.0.1 20180413 (experimental)
>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13db48be400000
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+0eefc1e06a77d327a056@...kaller.appspotmail.com
>
> This looks like it's a Smack issue?
Looks like it.
Happens only on smack instance:
https://syzkaller.appspot.com/bug?extid=0eefc1e06a77d327a056
Let's add +smack maintainers.
>> 8021q: adding VLAN 0 to HW filter on device team0
>> 8021q: adding VLAN 0 to HW filter on device team0
>> syz-executor0 (11193) used greatest stack depth: 15352 bytes left
>>
>> ======================================================
>> WARNING: possible circular locking dependency detected
>> 4.19.0-rc2+ #1 Not tainted
>> ------------------------------------------------------
>> syz-executor3/11182 is trying to acquire lock:
>> 00000000c157b042 (sb_internal){.+.+}, at: sb_start_intwrite
>> include/linux/fs.h:1613 [inline]
>> 00000000c157b042 (sb_internal){.+.+}, at: ext4_evict_inode+0x588/0x19b0
>> fs/ext4/inode.c:250
>>
>> but task is already holding lock:
>> 00000000128cdd3b (fs_reclaim){+.+.}, at: fs_reclaim_acquire.part.98+0x0/0x30
>> mm/page_alloc.c:463
>>
>> which lock already depends on the new lock.
>>
>>
>> the existing dependency chain (in reverse order) is:
>>
>> -> #3 (fs_reclaim){+.+.}:
>> __fs_reclaim_acquire mm/page_alloc.c:3728 [inline]
>> fs_reclaim_acquire.part.98+0x24/0x30 mm/page_alloc.c:3739
>> fs_reclaim_acquire+0x14/0x20 mm/page_alloc.c:3740
>> slab_pre_alloc_hook mm/slab.h:418 [inline]
>> slab_alloc mm/slab.c:3378 [inline]
>> kmem_cache_alloc_trace+0x2d/0x730 mm/slab.c:3618
>> kmalloc include/linux/slab.h:513 [inline]
>> kzalloc include/linux/slab.h:707 [inline]
>> smk_fetch.part.24+0x5a/0xf0 security/smack/smack_lsm.c:273
>> smk_fetch security/smack/smack_lsm.c:3548 [inline]
>> smack_d_instantiate+0x946/0xea0 security/smack/smack_lsm.c:3502
>> security_d_instantiate+0x5c/0xf0 security/security.c:1287
>> d_instantiate+0x5e/0xa0 fs/dcache.c:1870
>> shmem_mknod+0x189/0x1f0 mm/shmem.c:2812
>> vfs_mknod+0x447/0x800 fs/namei.c:3719
>> handle_create+0x1ff/0x7c0 drivers/base/devtmpfs.c:211
>> handle drivers/base/devtmpfs.c:374 [inline]
>> devtmpfsd+0x27f/0x4c0 drivers/base/devtmpfs.c:400
>> kthread+0x35a/0x420 kernel/kthread.c:246
>> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
>>
>> -> #2 (&isp->smk_lock){+.+.}:
>> __mutex_lock_common kernel/locking/mutex.c:925 [inline]
>> __mutex_lock+0x171/0x1700 kernel/locking/mutex.c:1073
>> mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
>> smack_d_instantiate+0x130/0xea0 security/smack/smack_lsm.c:3369
>> security_d_instantiate+0x5c/0xf0 security/security.c:1287
>> d_instantiate_new+0x7e/0x160 fs/dcache.c:1889
>> ext4_add_nondir+0x81/0x90 fs/ext4/namei.c:2415
>> ext4_symlink+0x761/0x1170 fs/ext4/namei.c:3162
>> vfs_symlink+0x37a/0x5d0 fs/namei.c:4127
>> do_symlinkat+0x242/0x2d0 fs/namei.c:4154
>> __do_sys_symlink fs/namei.c:4173 [inline]
>> __se_sys_symlink fs/namei.c:4171 [inline]
>> __x64_sys_symlink+0x59/0x80 fs/namei.c:4171
>> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>
>> -> #1 (jbd2_handle){++++}:
>> start_this_handle+0x5c0/0x1260 fs/jbd2/transaction.c:385
>> jbd2__journal_start+0x3c9/0x9f0 fs/jbd2/transaction.c:439
>> __ext4_journal_start_sb+0x18d/0x590 fs/ext4/ext4_jbd2.c:81
>> ext4_sample_last_mounted fs/ext4/file.c:414 [inline]
>> ext4_file_open+0x552/0x7b0 fs/ext4/file.c:439
>> do_dentry_open+0x499/0x1250 fs/open.c:771
>> vfs_open+0xa0/0xd0 fs/open.c:880
>> do_last fs/namei.c:3418 [inline]
>> path_openat+0x130f/0x5340 fs/namei.c:3534
>> do_filp_open+0x255/0x380 fs/namei.c:3564
>> do_open_execat+0x221/0x8e0 fs/exec.c:853
>> __do_execve_file.isra.35+0x1707/0x2460 fs/exec.c:1755
>> do_execveat_common fs/exec.c:1866 [inline]
>> do_execve fs/exec.c:1883 [inline]
>> __do_sys_execve fs/exec.c:1964 [inline]
>> __se_sys_execve fs/exec.c:1959 [inline]
>> __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959
>> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>
>> -> #0 (sb_internal){.+.+}:
>> lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
>> percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36
>> [inline]
>> percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
>> __sb_start_write+0x1e9/0x300 fs/super.c:1387
>> sb_start_intwrite include/linux/fs.h:1613 [inline]
>> ext4_evict_inode+0x588/0x19b0 fs/ext4/inode.c:250
>> evict+0x4ae/0x990 fs/inode.c:558
>> iput_final fs/inode.c:1547 [inline]
>> iput+0x5fa/0xa00 fs/inode.c:1573
>> dentry_unlink_inode+0x461/0x5e0 fs/dcache.c:374
>> __dentry_kill+0x44c/0x7a0 fs/dcache.c:566
>> dentry_kill+0xc9/0x5a0 fs/dcache.c:685
>> shrink_dentry_list+0x36c/0x7c0 fs/dcache.c:1090
>> prune_dcache_sb+0x12f/0x1c0 fs/dcache.c:1171
>> super_cache_scan+0x270/0x480 fs/super.c:102
>> do_shrink_slab+0x4ba/0xbb0 mm/vmscan.c:536
>> shrink_slab_memcg mm/vmscan.c:601 [inline]
>> shrink_slab+0x6fe/0x8c0 mm/vmscan.c:674
>> shrink_node+0x429/0x16a0 mm/vmscan.c:2735
>> shrink_zones mm/vmscan.c:2964 [inline]
>> do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026
>> try_to_free_pages+0x4b2/0xa60 mm/vmscan.c:3241
>> __perform_reclaim mm/page_alloc.c:3769 [inline]
>> __alloc_pages_direct_reclaim mm/page_alloc.c:3790 [inline]
>> __alloc_pages_slowpath+0x95a/0x2cb0 mm/page_alloc.c:4191
>> __alloc_pages_nodemask+0xa1b/0xd10 mm/page_alloc.c:4390
>> __alloc_pages include/linux/gfp.h:473 [inline]
>> __alloc_pages_node include/linux/gfp.h:486 [inline]
>> kmem_getpages mm/slab.c:1409 [inline]
>> cache_grow_begin+0x91/0x710 mm/slab.c:2677
>> fallback_alloc+0x203/0x2c0 mm/slab.c:3219
>> ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3287
>> slab_alloc_node mm/slab.c:3327 [inline]
>> kmem_cache_alloc_node_trace+0xe9/0x720 mm/slab.c:3661
>> __do_kmalloc_node mm/slab.c:3681 [inline]
>> __kmalloc_node+0x33/0x70 mm/slab.c:3689
>> kmalloc_node include/linux/slab.h:555 [inline]
>> kvmalloc_node+0xb9/0xf0 mm/util.c:423
>> kvmalloc include/linux/mm.h:577 [inline]
>> sem_alloc ipc/sem.c:497 [inline]
>> newary+0x244/0xb50 ipc/sem.c:527
>> ipcget_new ipc/util.c:315 [inline]
>> ipcget+0x15d/0x11d0 ipc/util.c:614
>> ksys_semget+0x1c0/0x280 ipc/sem.c:604
>> __do_sys_semget ipc/sem.c:609 [inline]
>> __se_sys_semget ipc/sem.c:607 [inline]
>> __x64_sys_semget+0x73/0xb0 ipc/sem.c:607
>> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>>
>> other info that might help us debug this:
>>
>> Chain exists of:
>> sb_internal --> &isp->smk_lock --> fs_reclaim
>>
>> Possible unsafe locking scenario:
>>
>> CPU0 CPU1
>> ---- ----
>> lock(fs_reclaim);
>> lock(&isp->smk_lock);
>> lock(fs_reclaim);
>> lock(sb_internal);
>>
>> *** DEADLOCK ***
>>
>> 4 locks held by syz-executor3/11182:
>> #0: 000000000ed49aa7 (&ids->rwsem){+.+.}, at: ipcget_new ipc/util.c:314
>> [inline]
>> #0: 000000000ed49aa7 (&ids->rwsem){+.+.}, at: ipcget+0x125/0x11d0
>> ipc/util.c:614
>> #1: 00000000128cdd3b (fs_reclaim){+.+.}, at:
>> fs_reclaim_acquire.part.98+0x0/0x30 mm/page_alloc.c:463
>> #2: 00000000c7d74038 (shrinker_rwsem){++++}, at: shrink_slab_memcg
>> mm/vmscan.c:578 [inline]
>> #2: 00000000c7d74038 (shrinker_rwsem){++++}, at: shrink_slab+0x1d1/0x8c0
>> mm/vmscan.c:674
>> #3: 00000000a3e33771 (&type->s_umount_key#28){++++}, at:
>> trylock_super+0x22/0x110 fs/super.c:412
>>
>> stack backtrace:
>> CPU: 1 PID: 11182 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #1
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>> __dump_stack lib/dump_stack.c:77 [inline]
>> dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
>> print_circular_bug.isra.34.cold.55+0x1bd/0x27d
>> kernel/locking/lockdep.c:1222
>> check_prev_add kernel/locking/lockdep.c:1862 [inline]
>> check_prevs_add kernel/locking/lockdep.c:1975 [inline]
>> validate_chain kernel/locking/lockdep.c:2416 [inline]
>> __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3412
>> lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
>> percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
>> percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
>> __sb_start_write+0x1e9/0x300 fs/super.c:1387
>> sb_start_intwrite include/linux/fs.h:1613 [inline]
>> ext4_evict_inode+0x588/0x19b0 fs/ext4/inode.c:250
>> evict+0x4ae/0x990 fs/inode.c:558
>> iput_final fs/inode.c:1547 [inline]
>> iput+0x5fa/0xa00 fs/inode.c:1573
>> dentry_unlink_inode+0x461/0x5e0 fs/dcache.c:374
>> __dentry_kill+0x44c/0x7a0 fs/dcache.c:566
>> dentry_kill+0xc9/0x5a0 fs/dcache.c:685
>> shrink_dentry_list+0x36c/0x7c0 fs/dcache.c:1090
>> prune_dcache_sb+0x12f/0x1c0 fs/dcache.c:1171
>> super_cache_scan+0x270/0x480 fs/super.c:102
>> do_shrink_slab+0x4ba/0xbb0 mm/vmscan.c:536
>> shrink_slab_memcg mm/vmscan.c:601 [inline]
>> shrink_slab+0x6fe/0x8c0 mm/vmscan.c:674
>> shrink_node+0x429/0x16a0 mm/vmscan.c:2735
>> shrink_zones mm/vmscan.c:2964 [inline]
>> do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026
>> try_to_free_pages+0x4b2/0xa60 mm/vmscan.c:3241
>> __perform_reclaim mm/page_alloc.c:3769 [inline]
>> __alloc_pages_direct_reclaim mm/page_alloc.c:3790 [inline]
>> __alloc_pages_slowpath+0x95a/0x2cb0 mm/page_alloc.c:4191
>> __alloc_pages_nodemask+0xa1b/0xd10 mm/page_alloc.c:4390
>> __alloc_pages include/linux/gfp.h:473 [inline]
>> __alloc_pages_node include/linux/gfp.h:486 [inline]
>> kmem_getpages mm/slab.c:1409 [inline]
>> cache_grow_begin+0x91/0x710 mm/slab.c:2677
>> fallback_alloc+0x203/0x2c0 mm/slab.c:3219
>> ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3287
>> slab_alloc_node mm/slab.c:3327 [inline]
>> kmem_cache_alloc_node_trace+0xe9/0x720 mm/slab.c:3661
>> __do_kmalloc_node mm/slab.c:3681 [inline]
>> __kmalloc_node+0x33/0x70 mm/slab.c:3689
>> kmalloc_node include/linux/slab.h:555 [inline]
>> kvmalloc_node+0xb9/0xf0 mm/util.c:423
>> kvmalloc include/linux/mm.h:577 [inline]
>> sem_alloc ipc/sem.c:497 [inline]
>> newary+0x244/0xb50 ipc/sem.c:527
>> ipcget_new ipc/util.c:315 [inline]
>> ipcget+0x15d/0x11d0 ipc/util.c:614
>> ksys_semget+0x1c0/0x280 ipc/sem.c:604
>> __do_sys_semget ipc/sem.c:609 [inline]
>> __se_sys_semget ipc/sem.c:607 [inline]
>> __x64_sys_semget+0x73/0xb0 ipc/sem.c:607
>> do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
>> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>> RIP: 0033:0x457099
>> Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
>> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff
>> 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
>> RSP: 002b:00007fbecf217c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000040
>> RAX: ffffffffffffffda RBX: 00007fbecf2186d4 RCX: 0000000000457099
>> RDX: 0000000000000000 RSI: 0000000000004007 RDI: 0000000000000000
>> RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
>> R13: 00000000004d4740 R14: 00000000004c8d3e R15: 0000000000000000
>> syz-executor4 (11186) used greatest stack depth: 15080 bytes left
>> syz-executor7 (11171) used greatest stack depth: 14344 bytes left
>> syz-executor2 (11260) used greatest stack depth: 14296 bytes left
>> syz-executor0 invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE),
>> nodemask=(null), order=0, oom_score_adj=0
>> syz-executor0 cpuset=syz0 mems_allowed=0
>> CPU: 0 PID: 11308 Comm: syz-executor0 Not tainted 4.19.0-rc2+ #1
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>> Google 01/01/2011
>> Call Trace:
>> __dump_stack lib/dump_stack.c:77 [inline]
>> dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
>> dump_header+0x27b/0xf70 mm/oom_kill.c:441
>> oom_kill_process.cold.28+0x10/0x95a mm/oom_kill.c:953
>> out_of_memory+0xa88/0x1430 mm/oom_kill.c:1120
>> __alloc_pages_may_oom mm/page_alloc.c:3522 [inline]
>> __alloc_pages_slowpath+0x223f/0x2cb0 mm/page_alloc.c:4235
>> __alloc_pages_nodemask+0xa1b/0xd10 mm/page_alloc.c:4390
>> alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2093
>> alloc_pages include/linux/gfp.h:509 [inline]
>> __page_cache_alloc+0x398/0x5e0 mm/filemap.c:946
>> page_cache_read mm/filemap.c:2385 [inline]
>> filemap_fault+0x1458/0x2220 mm/filemap.c:2569
>> ext4_filemap_fault+0x82/0xad fs/ext4/inode.c:6257
>> __do_fault+0xee/0x450 mm/memory.c:3240
>> do_read_fault mm/memory.c:3652 [inline]
>> do_fault mm/memory.c:3752 [inline]
>> handle_pte_fault mm/memory.c:3983 [inline]
>> __handle_mm_fault+0x2b4a/0x4350 mm/memory.c:4107
>> handle_mm_fault+0x53e/0xc80 mm/memory.c:4144
>> __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1395
>> do_page_fault+0xf6/0x7a4 arch/x86/mm/fault.c:1470
>> page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1161
>> RIP: 0033:0x40a056
>> Code: Bad RIP value.
>> RSP: 002b:00007ffd766513d0 EFLAGS: 00010283
>> RAX: 0000000000730a08 RBX: 00000000009300a0 RCX: 0000000000000001
>> RDX: 0000000000000001 RSI: ffffffffffffffff RDI: 00000000004bce88
>> RBP: 00000000009300a0 R08: 0000000000000009 R09: 0000000000000001
>> R10: 00007ffd766514d0 R11: 0000000000000000 R12: 0000000000930aa0
>> R13: 000000000093014c R14: 000000000001f9ab R15: 000000000001f97e
>> Mem-Info:
>> active_anon:4715 inactive_anon:367 isolated_anon:0
>> active_file:31 inactive_file:10 isolated_file:0
>> unevictable:0 dirty:0 writeback:0 unstable:0
>> slab_reclaimable:11145 slab_unreclaimable:1533913
>> mapped:177 shmem:377 pagetables:511 bounce:0
>> free:24282 free_pcp:0 free_cma:0
>> Node 0 active_anon:18860kB inactive_anon:1468kB active_file:116kB
>> inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):56kB
>> mapped:708kB dirty:0kB writeback:0kB shmem:1508kB shmem_thp: 0kB
>> shmem_pmdmapped: 0kB anon_thp: 6144kB writeback_tmp:0kB unstable:0kB
>> all_unreclaimable? yes
>> Node 0 DMA free:15908kB min:164kB low:204kB high:244kB active_anon:0kB
>> inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB
>> writepending:0kB present:15992kB managed:15908kB mlocked:0kB
>> kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB
>> free_cma:0kB
>> lowmem_reserve[]: 0 2842 6348 6348
>> Node 0 DMA32 free:44052kB min:30180kB low:37724kB high:45268kB
>> active_anon:2056kB inactive_anon:0kB active_file:40kB inactive_file:72kB
>> unevictable:0kB writepending:0kB present:3129292kB managed:2914192kB
>> mlocked:0kB kernel_stack:32kB pagetables:0kB bounce:0kB free_pcp:0kB
>> local_pcp:0kB free_cma:0kB
>> lowmem_reserve[]: 0 0 3506 3506
>> Node 0 Normal free:37168kB min:37236kB low:46544kB high:55852kB
>> active_anon:16804kB inactive_anon:1468kB active_file:176kB inactive_file:0kB
>> unevictable:0kB writepending:0kB present:4718592kB managed:3590864kB
>> mlocked:0kB kernel_stack:5216kB pagetables:2044kB bounce:0kB free_pcp:0kB
>> local_pcp:0kB free_cma:0kB
>> lowmem_reserve[]: 0 0 0 0
>> Node 0 DMA: 1*4kB (U) 0*8kB 0*16kB 1*32kB (U) 2*64kB (U) 1*128kB (U) 1*256kB
>> (U) 0*512kB 1*1024kB (U) 1*2048kB (M) 3*4096kB (M) = 15908kB
>> Node 0 DMA32: 5*4kB (ME) 7*8kB (UME) 4*16kB (ME) 4*32kB (ME) 4*64kB (ME)
>> 2*128kB (UE) 4*256kB (UME) 3*512kB (ME) 4*1024kB (UME) 4*2048kB (UME)
>> 7*4096kB (M) = 44300kB
>> Node 0 Normal: 867*4kB (UME) 448*8kB (M) 250*16kB (ME) 106*32kB (ME) 51*64kB
>> (ME) 46*128kB (ME) 20*256kB (M) 15*512kB (M) 1*1024kB (E) 0*2048kB 0*4096kB
>> = 37420kB
>> Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0
>> hugepages_size=2048kB
>> 424 total pagecache pages
>> 0 pages in swap cache
>> Swap cache stats: add 0, delete 0, find 0/0
>> Free swap = 0kB
>> Total swap = 0kB
>> 1965969 pages RAM
>> 0 pages HighMem/MovableOnly
>> 335728 pages reserved
>> Unreclaimable slab info:
>> Name Used Total
>> pid_2 131KB 156KB
>> TIPC 12KB 14KB
>> SCTPv6 18KB 24KB
>> DCCPv6 21KB 29KB
>> DCCP 20KB 27KB
>> bridge_fdb_cache 15KB 19KB
>> fib6_nodes 103KB 108KB
>> ip6_dst_cache 113KB 300KB
>> RAWv6 87KB 91KB
>> UDPv6 3KB 3KB
>> TCPv6 29KB 29KB
>> nf_conntrack 2KB 3KB
>> sd_ext_cdb 0KB 3KB
>> scsi_sense_cache 1056KB 1060KB
>> virtio_scsi_cmd 16KB 16KB
>> sgpool-128 8KB 8KB
>> sgpool-64 4KB 6KB
>> sgpool-32 2KB 7KB
>> sgpool-16 1KB 3KB
>> sgpool-8 0KB 3KB
>> mqueue_inode_cache 12KB 21KB
>> bio_post_read_ctx 14KB 15KB
>> bio-2 14KB 15KB
>> jfs_mp 7KB 7KB
>> nfs_commit_data 3KB 7KB
>> nfs_write_data 34KB 37KB
>> jbd2_inode 2KB 3KB
>> ext4_system_zone 0KB 3KB
>> bio-1 1KB 3KB
>> pid_namespace 2KB 7KB
>> rpc_buffers 17KB 19KB
>> rpc_tasks 2KB 3KB
>> UNIX 12KB 47KB
>> tcp_bind_bucket 1KB 4KB
>> ip_fib_trie 14KB 19KB
>> ip_fib_alias 69KB 71KB
>> ip_dst_cache 0KB 8KB
>> RAW 51KB 57KB
>> UDP 19KB 39KB
>> TCP 5KB 5KB
>> hugetlbfs_inode_cache 1KB 7KB
>> fscache_cookie_jar 0KB 7KB
>> eventpoll_pwq 51KB 51KB
>> eventpoll_epi 90KB 90KB
>> inotify_inode_mark 90KB 90KB
>> request_queue 159KB 159KB
>> blkdev_requests 1KB 3KB
>> blkdev_ioc 23KB 23KB
>> bio-0 536KB 536KB
>> biovec-max 1658KB 1658KB
>> biovec-64 401KB 401KB
>> biovec-16 127KB 127KB
>> bio_integrity_payload 1KB 4KB
>> khugepaged_mm_slot 27KB 27KB
>> dmaengine-unmap-2 0KB 3KB
>> skbuff_fclone_cache 1KB 18KB
>> skbuff_head_cache 673KB 1916KB
>> configfs_dir_cache 0KB 4KB
>> file_lock_cache 1KB 7KB
>> file_lock_ctx 0KB 3KB
>> fsnotify_mark_connector 51KB 51KB
>> net_namespace 69KB 69KB
>> shmem_inode_cache 3043KB 3043KB
>> task_delay_info 125KB 371KB
>> taskstats 176KB 176KB
>> proc_dir_entry 680KB 682KB
>> pde_opener 0KB 3KB
>> seq_file 362KB 362KB
>> sigqueue 126KB 401KB
>> kernfs_node_cache 11279KB 11284KB
>> mnt_cache 85KB 108KB
>> filp 4848KB 8073KB
>> names_cache 121567KB 121567KB
>> inode_smack 4817KB 4817KB
>> key_jar 3KB 7KB
>> uts_namespace 3KB 7KB
>> nsproxy 1KB 7KB
>> vm_area_struct 8830KB 12970KB
>> mm_struct 1462KB 3614KB
>> fs_cache 161KB 496KB
>> files_cache 538KB 1256KB
>> signal_cache 915KB 2185KB
>> sighand_cache 395KB 395KB
>> task_struct 3249KB 3304KB
>> cred_jar 795KB 2348KB
>> anon_vma_chain 4757KB 6000KB
>> anon_vma 237KB 392KB
>> pid 73KB 228KB
>> Acpi-Operand 312KB 772KB
>> Acpi-Namespace 102KB 104KB
>> numa_policy 0KB 3KB
>> debug_objects_cache 1125KB 1126KB
>> trace_event_file 243KB 247KB
>> ftrace_event_field 348KB 350KB
>> pool_workqueue 67KB 72KB
>> task_group 7KB 7KB
>> page->ptl 1564KB 3300KB
>> kmalloc-4194304 5713920KB 5713920KB
>> kmalloc-2097152 2050KB 2050KB
>> kmalloc-524288 2056KB 2056KB
>> kmalloc-262144 1290KB 1290KB
>> kmalloc-131072 650KB 650KB
>> kmalloc-65536 330KB 330KB
>> kmalloc-32768 891KB 990KB
>> kmalloc-16384 412KB 462KB
>> kmalloc-8192 2004KB 2004KB
>> kmalloc-4096 18670KB 18708KB
>> kmalloc-2048 6464KB 7764KB
>> kmalloc-1024 4572KB 5244KB
>> kmalloc-512 3885KB 5812KB
>> kmalloc-256 4762KB 4762KB
>> kmalloc-128 901KB 901KB
>> kmalloc-96 1935KB 2112KB
>> kmalloc-64 1843KB 1896KB
>> kmalloc-32 1849KB 1956KB
>> kmalloc-192 2706KB 4076KB
>> kmem_cache 221KB 221KB
>> Tasks state (memory values in pages):
>> [ pid ] uid tgid total_vm rss pgtables_bytes swapents
>> oom_score_adj name
>> [ 2347] 0 2347 278 186 32768 0 0 none
>> [ 2539] 0 2539 5377 170 86016 0 -1000
>> udevd
>> [ 2754] 0 2754 5376 171 81920 0 -1000
>> udevd
>> [ 4381] 0 4381 2493 573 65536 0 0
>> dhclient
>> [ 4544] 0 4544 14267 155 118784 0 0
>> rsyslogd
>> [ 4587] 0 4587 4725 49 86016 0 0 cron
>> [ 4613] 0 4613 12490 153 139264 0 -1000 sshd
>> [ 4638] 0 4638 3694 42 69632 0 0
>> getty
>> [ 4639] 0 4639 3694 39 77824 0 0
>> getty
>> [ 4640] 0 4640 3694 41 77824 0 0
>> getty
>> [ 4641] 0 4641 3694 41 77824 0 0
>> getty
>> [ 4642] 0 4642 3694 39 73728 0 0
>> getty
>> [ 4643] 0 4643 3694 40 77824 0 0
>> getty
>> [ 4644] 0 4644 3649 41 73728 0 0
>> getty
>> [ 4645] 0 4645 5310 115 81920 0 -1000
>> udevd
>> [ 4663] 0 4663 17821 198 188416 0 0 sshd
>> [ 4665] 0 4665 41970 1817 163840 0 0
>> syz-execprog
>> [ 4676] 0 4676 9360 15 40960 0 0
>> syz-executor4
>> [ 4678] 0 4678 9360 15 40960 0 0
>> syz-executor5
>> [ 4677] 0 4677 9359 22 49152 0 0
>> syz-executor4
>> [ 4681] 0 4681 9360 15 40960 0 0
>> syz-executor3
>> [ 4682] 0 4682 9360 15 40960 0 0
>> syz-executor0
>> [ 4683] 0 4683 9359 21 49152 0 0
>> syz-executor5
>> [ 4685] 0 4685 9360 15 40960 0 0
>> syz-executor7
>> [ 4686] 0 4686 9359 22 49152 0 0
>> syz-executor3
>> [ 4687] 0 4687 9360 15 40960 0 0
>> syz-executor6
>> [ 4688] 0 4688 9359 22 49152 0 0
>> syz-executor0
>> [ 4689] 0 4689 9359 21 49152 0 0
>> syz-executor7
>> [ 4690] 0 4690 9360 15 40960 0 0
>> syz-executor2
>> [ 4691] 0 4691 9359 22 49152 0 0
>> syz-executor6
>> [ 4692] 0 4692 9360 14 40960 0 0
>> syz-executor1
>> [ 4693] 0 4693 9359 22 49152 0 0
>> syz-executor2
>> [ 4694] 0 4694 9359 21 53248 0 0
>> syz-executor1
>> [ 6704] 0 6704 5310 115 81920 0 -1000
>> udevd
>> [ 6710] 0 6710 5310 115 81920 0 -1000
>> udevd
>> [ 6737] 0 6737 5376 171 81920 0 -1000
>> udevd
>> [ 6804] 0 6804 5376 172 81920 0 -1000
>> udevd
>> [ 6819] 0 6819 5376 172 81920 0 -1000
>> udevd
>> [ 7149] 0 7149 5376 172 81920 0 -1000
>> udevd
>> [ 11308] 0 11308 9425 22 61440 0 0
>> syz-executor0
>> [ 11311] 0 11311 9425 534 61440 0 0
>> syz-executor6
>> Out of memory: Kill process 4665 (syz-execprog) score 1 or sacrifice child
>> Killed process 4676 (syz-executor4) total-vm:37440kB, anon-rss:60kB,
>> file-rss:0kB, shmem-rss:0kB
>> syz-executor0 (11308) used greatest stack depth: 14040 bytes left
>> device bridge_slave_1 left promiscuous mode
>> bridge0: port 2(bridge_slave_1) entered disabled state
>> device bridge_slave_0 left promiscuous mode
>> bridge0: port 1(bridge_slave_0) entered disabled state
>> team0 (unregistering): Port device team_slave_1 removed
>> IPVS: ftp: loaded support on port[0] = 21
>> team0 (unregistering): Port device team_slave_0 removed
>> bond0 (unregistering): Releasing backup interface bond_slave_1
>> bond0 (unregistering): Releasing backup interface bond_slave_0
>> bond0 (unregistering): Released all slaves
>> bridge0: port 1(bridge_slave_0) entered blocking state
>> bridge0: port 1(bridge_slave_0) entered disabled state
>> device bridge_slave_0 entered promiscuous mode
>> bridge0: port 2(bridge_slave_1) entered blocking state
>> bridge0: port 2(bridge_slave_1) entered disabled state
>> device bridge_slave_1 entered promiscuous mode
>> IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready
>> IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready
>> bond0: Enslaving bond_slave_0 as an active interface with an up link
>> bond0: Enslaving bond_slave_1 as an active interface with an up link
>> IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready
>> team0: Port device team_slave_0 added
>> IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready
>> team0: Port device team_slave_1 added
>> IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready
>> IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready
>> IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready
>> IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
>> bridge0: port 2(bridge_slave_1) entered blocking state
>> bridge0: port 2(bridge_slave_1) entered forwarding state
>> bridge0: port 1(bridge_slave_0) entered blocking state
>> bridge0: port 1(bridge_slave_0) entered forwarding state
>> IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
>> 8021q: adding VLAN 0 to HW filter on device bond0
>> IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
>> IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
>> IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
>> 8021q: adding VLAN 0 to HW filter on device team0
>> IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
>> IPv6: ADDRCONF(NETDEV_CHANGE): bridge0: link becomes ready
>>
>>
>> ---
>> This bug is generated by a bot. It may contain errors.
>> See https://goo.gl/tpsmEJ for more information about syzbot.
>> syzbot engineers can be reached at syzkaller@...glegroups.com.
>>
>> syzbot will keep track of this bug report. See:
>> https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
>> syzbot.
>> syzbot can test patches for this bug, for details see:
>> https://goo.gl/tpsmEJ#testing-patches
>
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