BUG: Bad rss-counter state mm:000000005cb1e020 idx:1 val:4
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6730 at fs/kernfs/dir.c:494 kernfs_get.part.0.cold+0x11/0x18 fs/kernfs/dir.c:494
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6730 Comm: syz-executor.2 Not tainted 4.19.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x46 kernel/panic.c:541
 report_bug+0x262/0x2a0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:kernfs_get.part.0.cold+0x11/0x18 fs/kernfs/dir.c:494
Code: ff e8 6c f2 9e ff 48 c7 c7 40 56 77 87 e8 99 97 8a ff 0f 0b e9 9d aa ff ff e8 54 f2 9e ff 48 c7 c7 40 56 77 87 e8 81 97 8a ff <0f> 0b e9 81 ae ff ff e8 3c f2 9e ff 48 c7 c7 40 56 77 87 e8 69 97
RSP: 0018:ffff88809554f9f0 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff88800010dee0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81534081 RDI: ffffed1012aa9f30
RBP: 0000000000000000 R08: 0000000000000024 R09: ffffed1015cc5081
R10: ffffed1015cc5080 R11: ffff8880ae628407 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff88804a4b5c00 R15: ffff888088cde380
 kernfs_get fs/kernfs/dir.c:493 [inline]
 __kernfs_remove fs/kernfs/dir.c:1307 [inline]
 __kernfs_remove+0x27e/0x940 fs/kernfs/dir.c:1275
 kernfs_remove+0x1f/0x30 fs/kernfs/dir.c:1351
 sysfs_remove_group+0xe1/0x1b0 fs/sysfs/group.c:265
 device_del+0x128/0xaf0 drivers/base/core.c:2303
 device_unregister+0x11/0x30 drivers/base/core.c:2362
 bdi_unregister+0x451/0x630 mm/backing-dev.c:949
 release_bdi mm/backing-dev.c:965 [inline]
 kref_put include/linux/kref.h:70 [inline]
 bdi_put+0x141/0x170 mm/backing-dev.c:974
 generic_shutdown_super+0x2aa/0x370 fs/super.c:470
 kill_anon_super+0x36/0x60 fs/super.c:1032
 v9fs_kill_super+0x39/0x90 fs/9p/vfs_super.c:230
 deactivate_locked_super+0x8c/0xf0 fs/super.c:329
 deactivate_super fs/super.c:360 [inline]
 deactivate_super+0x18d/0x1b0 fs/super.c:356
 cleanup_mnt+0xb8/0x150 fs/namespace.c:1098
 task_work_run+0x13f/0x1b0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
 do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45f457
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 8f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 ad 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffedc041748 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 000000000008cc4d RCX: 000000000045f457
RDX: 00000000004031d8 RSI: 0000000000000002 RDI: 00007ffedc0417f0
RBP: 000000000000065a R08: 0000000000000000 R09: 000000000000000b
R10: 0000000000000005 R11: 0000000000000246 R12: 00007ffedc042880
R13: 0000000001b5d940 R14: 0000000000000000 R15: 00007ffedc042880
Kernel Offset: disabled

======================================================