[26222]     0 26203    18275        5      33       4        0          1000 syz-executor.4
Out of memory: Kill process 21875 (syz-executor.2) score 1005 or sacrifice child
Killed process 21875 (syz-executor.2) total-vm:72572kB, anon-rss:172kB, file-rss:34688kB, shmem-rss:0kB
oom_reaper: reaped process 21875 (syz-executor.2), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
------------[ cut here ]------------
WARNING: CPU: 0 PID: 21875 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: 0 PID: 21875 Comm: syz-executor.2 Not tainted 4.9.141+ #1
 ffff880155ca7660 ffffffff81b42e79 ffffffff82a38ce0 00000000ffffffff
 ffffffff82a34000 0000000000000000 0000000000000009 ffff880155ca7720
 ffffffff813f7125 0000000041b58ab3 ffffffff82e2b62b ffffffff813f6f66
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff813f7125>] panic+0x1bf/0x39f kernel/panic.c:179
 [<ffffffff813f7362>] __warn.cold.8+0x2f/0x2f kernel/panic.c:542
 [<ffffffff810dc02c>] warn_slowpath_null+0x2c/0x40 kernel/panic.c:585
 [<ffffffff810be9c2>] untrack_pfn+0x242/0x290 arch/x86/mm/pat.c:1019
 [<ffffffff8149a471>] unmap_single_vma+0x141/0x170 mm/memory.c:1315
 [<ffffffff8149ab51>] unmap_vmas+0x81/0xd0 mm/memory.c:1366
 [<ffffffff814b0c2c>] exit_mmap+0x1cc/0x3a0 mm/mmap.c:3021
 [<ffffffff810d265d>] __mmput kernel/fork.c:884 [inline]
 [<ffffffff810d265d>] mmput+0xcd/0x360 kernel/fork.c:906
 [<ffffffff810e6b89>] exit_mm kernel/exit.c:514 [inline]
 [<ffffffff810e6b89>] do_exit+0x6c9/0x2a50 kernel/exit.c:820
 [<ffffffff810ed3a1>] do_group_exit+0x111/0x300 kernel/exit.c:937
 [<ffffffff8110eb61>] get_signal+0x4e1/0x1460 kernel/signal.c:2321
 [<ffffffff81052aa5>] 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
 [<ffffffff82817893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..