syzbot

audit: type=1400 audit(1545521427.348:5): avc:  denied  { associate } for  pid=2111 comm="syz-executor4" name="syz4" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1
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WARNING: CPU: 1 PID: 6988 at arch/x86/mm/pat.c:1019 untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6988 Comm: syz-executor2 Not tainted 4.9.147+ #86
 ffff8801d27ef660 ffffffff81b43be9 ffffffff82a39060 00000000ffffffff
 ffffffff82a34400 0000000000000001 0000000000000009 ffff8801d27ef720
 ffffffff813f7745 0000000041b58ab3 ffffffff82e2ac3b ffffffff813f7586
Call Trace:
 [<ffffffff81b43be9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b43be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7745>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7982>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc0bc>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff810bea52>] untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
 [<ffffffff8149a791>] unmap_single_vma+0x141/0x170 mm/memory.c:1315
 [<ffffffff8149ae71>] unmap_vmas+0x81/0xd0 mm/memory.c:1366
 [<ffffffff814b0f4c>] exit_mmap+0x1cc/0x3a0 mm/mmap.c:3021
 [<ffffffff810d26ed>] __mmput kernel/fork.c:884 [inline]
 [<ffffffff810d26ed>] mmput+0xcd/0x360 kernel/fork.c:906
 [<ffffffff810e6c19>] exit_mm kernel/exit.c:514 [inline]
 [<ffffffff810e6c19>] do_exit+0x6c9/0x2a50 kernel/exit.c:820
 [<ffffffff810ed431>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110ebe1>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81052b35>] do_signal+0x95/0x1b00 arch/x86/kernel/signal.c:807
 [<ffffffff81003e2e>] exit_to_usermode_loop+0x10e/0x150 arch/x86/entry/common.c:158
 [<ffffffff81005932>] prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 [<ffffffff81005932>] syscall_return_slowpath arch/x86/entry/common.c:263 [inline]
 [<ffffffff81005932>] do_syscall_64+0x3e2/0x550 arch/x86/entry/common.c:290
 [<ffffffff8281a4d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..