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kernel panic: panic_on_warn set (2)

Status: closed as invalid on 2021/09/08 09:41
Subsystems: io-uring
[Documentation on labels]
First crash: 1192d, last: 1192d
Cause bisection: failed (error log, bisect log)
  
Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel panic: panic_on_warn set (4) kernel syz error 2 1189d 1189d 0/28 closed as invalid on 2021/09/13 11:45
android-54 kernel panic: panic_on_warn set C 52 1378d 1477d 0/2 auto-obsoleted due to no activity on 2023/04/24 19:54
upstream kernel panic: panic_on_warn set kernel syz error 1 1210d 1210d 0/28 closed as invalid on 2021/08/23 09:16
upstream kernel panic: panic_on_warn set (3) kernel syz error 1 1191d 1190d 0/28 closed as invalid on 2021/09/10 07:34

Sample crash report:
 handle drivers/base/devtmpfs.c:382 [inline]
 devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline]
 devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
==================================================================
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 22 Comm: kdevtmpfs Not tainted 5.14.0-next-20210907-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+0xcd/0x134 lib/dump_stack.c:106
 panic+0x2b0/0x6dd kernel/panic.c:232
 kfence_report_error.cold+0x304/0xa56 mm/kfence/report.c:271
 kfence_handle_page_fault+0x203/0x630 mm/kfence/core.c:883
 page_fault_oops+0x1c5/0x6b0 arch/x86/mm/fault.c:686
 kernelmode_fixup_or_oops+0x219/0x280 arch/x86/mm/fault.c:755
 __bad_area_nosemaphore+0x36d/0x400 arch/x86/mm/fault.c:801
 do_kern_addr_fault+0x5b/0x70 arch/x86/mm/fault.c:1200
 handle_page_fault arch/x86/mm/fault.c:1473 [inline]
 exc_page_fault+0x155/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
RIP: 0010:kvm_fastop_exception+0xf6a/0x1058
Code: d3 ed e9 ff 66 6d f8 49 8d 0e 48 83 e1 f8 4c 8b 21 41 8d 0e 83 e1 07 c1 e1 03 49 d3 ec e9 55 74 6d f8 49 8d 4d 00 48 83 e1 f8 <4c> 8b 21 41 8d 4d 00 83 e1 07 c1 e1 03 49 d3 ec e9 45 7e 6d f8 bd
RSP: 0018:ffffc90000dcfae8 EFLAGS: 00010282
RAX: 0000000036736376 RBX: ffff88806df6e4a8 RCX: ffff88823bd16020
RDX: ffffed100dbedc9c RSI: 0000000000000004 RDI: 0000000000000007
RBP: 0000000000000004 R08: 0000000000000000 R09: ffff88806df6e4d8
R10: ffffed100dbedc9b R11: 0000000000000000 R12: ffff88823bd16020
R13: ffff88823bd16020 R14: ffff88806df6e4d8 R15: dffffc0000000000
 d_lookup+0xd8/0x170 fs/dcache.c:2370
 lookup_dcache+0x1e/0x130 fs/namei.c:1520
 __lookup_hash+0x29/0x180 fs/namei.c:1543
 kern_path_locked+0x17e/0x320 fs/namei.c:2567
 handle_remove+0xa2/0x5fe drivers/base/devtmpfs.c:312
 handle drivers/base/devtmpfs.c:382 [inline]
 devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline]
 devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Kernel Offset: disabled
----------------
Code disassembly (best guess):
   0:	d3 ed                	shr    %cl,%ebp
   2:	e9 ff 66 6d f8       	jmpq   0xf86d6706
   7:	49 8d 0e             	lea    (%r14),%rcx
   a:	48 83 e1 f8          	and    $0xfffffffffffffff8,%rcx
   e:	4c 8b 21             	mov    (%rcx),%r12
  11:	41 8d 0e             	lea    (%r14),%ecx
  14:	83 e1 07             	and    $0x7,%ecx
  17:	c1 e1 03             	shl    $0x3,%ecx
  1a:	49 d3 ec             	shr    %cl,%r12
  1d:	e9 55 74 6d f8       	jmpq   0xf86d7477
  22:	49 8d 4d 00          	lea    0x0(%r13),%rcx
  26:	48 83 e1 f8          	and    $0xfffffffffffffff8,%rcx
* 2a:	4c 8b 21             	mov    (%rcx),%r12 <-- trapping instruction
  2d:	41 8d 4d 00          	lea    0x0(%r13),%ecx
  31:	83 e1 07             	and    $0x7,%ecx
  34:	c1 e1 03             	shl    $0x3,%ecx
  37:	49 d3 ec             	shr    %cl,%r12
  3a:	e9 45 7e 6d f8       	jmpq   0xf86d7e84
  3f:	bd                   	.byte 0xbd

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/09/08 05:55 linux-next b2bb710d34d5 064c9eb7 .config console log report syz ci-upstream-linux-next-kasan-gce-root kernel panic: panic_on_warn set
* Struck through repros no longer work on HEAD.