linux-kernel - [syzbot] BUG: sleeping function called from invalid context in __munlock

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Date:   Sat, 10 Jul 2021 15:12:17 -0700
From:   syzbot <syzbot+cf9c548279bff83b0c97@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] BUG: sleeping function called from invalid context in __munlock_pagevec

Hello,

syzbot found the following issue on:

HEAD commit:    ee268dee Add linux-next specific files for 20210707
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13ed30d2300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=59e1e3bbc3afca75
dashboard link: https://syzkaller.appspot.com/bug?extid=cf9c548279bff83b0c97
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17a25ee4300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14f81928300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cf9c548279bff83b0c97@...kaller.appspotmail.com

BUG: sleeping function called from invalid context at include/linux/pagemap.h:674
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 8467, name: syz-executor631
1 lock held by syz-executor631/8467:
 #0: ffff8880343e0978 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:359 [inline]
 #0: ffff8880343e0978 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: map_pte mm/page_vma_mapped.c:52 [inline]
 #0: ffff8880343e0978 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: page_vma_mapped_walk+0xd87/0x24f0 mm/page_vma_mapped.c:261
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 8467 Comm: syz-executor631 Not tainted 5.13.0-next-20210707-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9171
 lock_page include/linux/pagemap.h:674 [inline]
 __munlock_pagevec+0xa22/0x2340 mm/mlock.c:314
 munlock_vma_pages_range+0x9d7/0xf00 mm/mlock.c:475
 munlock_vma_pages_all mm/internal.h:354 [inline]
 unlock_range mm/mmap.c:2811 [inline]
 exit_mmap+0x47a/0x620 mm/mmap.c:3188
 __mmput+0x122/0x470 kernel/fork.c:1152
 mmput+0x58/0x60 kernel/fork.c:1173
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a60 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43e969
Code: Unable to access opcode bytes at RIP 0x43e93f.
RSP: 002b:00007ffce2d3a7a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004b02f0 RCX: 000000000043e969
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b02f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001

=============================
[ BUG: Invalid wait context ]
5.13.0-next-20210707-syzkaller #0 Tainted: G        W        
-----------------------------
syz-executor631/8467 is trying to lock:
ffff888035ea6000 (&mapping->i_mmap_rwsem){++++}-{3:3}, at: i_mmap_lock_read include/linux/fs.h:514 [inline]
ffff888035ea6000 (&mapping->i_mmap_rwsem){++++}-{3:3}, at: rmap_walk_file+0x52f/0x710 mm/rmap.c:2337
other info that might help us debug this:
context-{4:4}
1 lock held by syz-executor631/8467:
 #0: ffff8880343e0978 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:359 [inline]
 #0: ffff8880343e0978 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: map_pte mm/page_vma_mapped.c:52 [inline]
 #0: ffff8880343e0978 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: page_vma_mapped_walk+0xd87/0x24f0 mm/page_vma_mapped.c:261
stack backtrace:
CPU: 0 PID: 8467 Comm: syz-executor631 Tainted: G        W         5.13.0-next-20210707-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4666 [inline]
 check_wait_context kernel/locking/lockdep.c:4727 [inline]
 __lock_acquire.cold+0x213/0x3ab kernel/locking/lockdep.c:4965
 lock_acquire kernel/locking/lockdep.c:5625 [inline]
 lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590
 down_read+0x9a/0x440 kernel/locking/rwsem.c:1353
 i_mmap_lock_read include/linux/fs.h:514 [inline]
 rmap_walk_file+0x52f/0x710 mm/rmap.c:2337
 rmap_walk+0x10d/0x190 mm/rmap.c:2366
 page_mlock+0x448/0x650 mm/rmap.c:2029
 __munlock_isolated_page+0x88/0x410 mm/mlock.c:122
 __munlock_pagevec+0xd7f/0x2340 mm/mlock.c:322
 munlock_vma_pages_range+0x9d7/0xf00 mm/mlock.c:475
 munlock_vma_pages_all mm/internal.h:354 [inline]
 unlock_range mm/mmap.c:2811 [inline]
 exit_mmap+0x47a/0x620 mm/mmap.c:3188
 __mmput+0x122/0x470 kernel/fork.c:1152
 mmput+0x58/0x60 kernel/fork.c:1173
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a60 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43e969
Code: Unable to access opcode bytes at RIP 0x43e93f.
RSP: 002b:00007ffce2d3a7a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000004b02f0 RCX: 000000000043e969
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b02f0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001


---
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