syzbot


BUG: sleeping function called from invalid context in munlock_vma_pages_range

Status: fixed on 2021/11/10 00:50
Reported-by: syzbot+2e3ee45ea14cd0b81f26@syzkaller.appspotmail.com
Fix commit: 023e1a8dd502 mm/rmap: fix new bug: premature return from page_mlock_one()
First crash: 575d, last: 575d

Sample crash report:
BUG: sleeping function called from invalid context at mm/mlock.c:482
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 14373, name: syz-executor.5
INFO: lockdep is turned off.
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 PID: 14373 Comm: syz-executor.5 Tainted: G        W         5.13.0-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+0x1d3/0x29f lib/dump_stack.c:105
 ___might_sleep+0x4e5/0x6b0 kernel/sched/core.c:9154
 munlock_vma_pages_range+0xa80/0xf60 mm/mlock.c:482
 mlock_fixup+0x40f/0x580 mm/mlock.c:552
 apply_mlockall_flags mm/mlock.c:768 [inline]
 __do_sys_munlockall+0x1ef/0x310 mm/mlock.c:810
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f448bc37188 EFLAGS: 00000246 ORIG_RAX: 0000000000000098
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe7eb2d2ef R14: 00007f448bc37300 R15: 0000000000022000

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-kasan-gce-smack-root 2021/07/11 19:57 upstream 98f7fdced2e0 8f5a7b8c .config console log report info BUG: sleeping function called from invalid context in munlock_vma_pages_range
* Struck through repros no longer work on HEAD.