WARNING: CPU: 1 PID: 32465 at sound/core/timer_compat.c:69 snd_timer_user_info_compat.isra.6+0x3be/0x490 sound/core/timer_compat.c:69
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 32465 Comm: syz-executor7 Not tainted 4.14.0+ #98
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
FAULT_FLAG_ALLOW_RETRY missing 30
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:177
 fixup_bug arch/x86/kernel/traps.c:246 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:926
RIP: 0010:snd_timer_user_info_compat.isra.6+0x3be/0x490 sound/core/timer_compat.c:69
RSP: 0018:ffff880199ef7a70 EFLAGS: 00010212
RAX: 0000000000010000 RBX: 1ffff100333def51 RCX: ffffffff8402d83e
RDX: 000000000000004a RSI: ffffc90005ffe000 RDI: ffff8801c102d770
RBP: ffff880199ef7bd0 R08: ffffffff8403ab4b R09: 0000000000000004
R10: ffff880199ef7bd0 R11: ffffffff8747dd60 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff880199ef7ba8 R15: ffff880199ef7d18
 __snd_timer_user_ioctl_compat sound/core/timer_compat.c:161 [inline]
 snd_timer_user_ioctl_compat+0x4a6/0x890 sound/core/timer_compat.c:179
 C_SYSC_ioctl fs/compat_ioctl.c:1473 [inline]
 compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1419
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f9cc79
RSP: 002b:00000000f779801c EFLAGS: 00000296 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000080e05411
RDX: 00000000208bd000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
CPU: 0 PID: 32455 Comm: syz-executor4 Not tainted 4.14.0+ #98
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 handle_userfault+0x12fa/0x24c0 fs/userfaultfd.c:427
 do_anonymous_page mm/memory.c:3121 [inline]
 handle_pte_fault mm/memory.c:3934 [inline]
 __handle_mm_fault+0x2e8c/0x3ad0 mm/memory.c:4060
 handle_mm_fault+0x334/0x8d0 mm/memory.c:4097
 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1429
 do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1504
 page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1088
RIP: 0010:fault_in_pages_readable include/linux/pagemap.h:601 [inline]
RIP: 0010:iov_iter_fault_in_readable+0x1a7/0x410 lib/iov_iter.c:421
RSP: 0018:ffff8801cb75f790 EFLAGS: 00010246
RAX: 0000000000010000 RBX: 0000000020011fd2 RCX: ffffffff82505391
RDX: 000000000000010e RSI: ffffc90004aab000 RDI: ffff8801cb75fb90
RBP: ffff8801cb75f870 R08: ffff8801d7d5eeb8 R09: 1ffff100396ebeac
R10: ffff8801cf3a4400 R11: 0000000000000003 R12: 1ffff100396ebef5
R13: ffff8801cb75f848 R14: 0000000000000000 R15: ffff8801cb75fb88
 generic_perform_write+0x200/0x600 mm/filemap.c:3129
 __generic_file_write_iter+0x366/0x5b0 mm/filemap.c:3264
 generic_file_write_iter+0x399/0x7a0 mm/filemap.c:3292
 call_write_iter include/linux/fs.h:1772 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x68a/0x970 fs/read_write.c:482
 vfs_write+0x18f/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
 do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7fcdc79
RSP: 002b:00000000f77c901c EFLAGS: 00000296 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 0000000020011fd2
RDX: 0000000000000030 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..