kernel panic: KASAN: panic_on_warn set ...

Status: upstream: reported on 2026/08/04 22:35
Reported-by: syzbot+f346d6ec76cf21167792@syzkaller.appspotmail.com
First crash: 5d09h, last: 5d05h
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel panic: KASAN: panic_on_warn set ... block fs 2 11 184d 477d 0/29 auto-obsoleted due to no activity on 2026/05/18 06:02
linux-6.6 kernel panic: KASAN: panic_on_warn set ... 2 1 5d09h 5d09h 0/2 upstream: reported on 2026/08/04 22:32
linux-5.15 kernel panic: KASAN: panic_on_warn set ... 2 10 5d05h 5d13h 0/3 upstream: reported on 2026/08/04 18:29

Sample crash report:
Kernel panic - not syncing: KASAN: panic_on_warn set ...
CPU: 1 PID: 3640 Comm: udevd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 panic+0x2d3/0x710 kernel/panic.c:339
 check_panic_on_warn+0x80/0xa0 kernel/panic.c:235
 end_report+0x66/0x110 mm/kasan/report.c:200
 kasan_report+0x118/0x140 mm/kasan/report.c:526
 string_nocheck lib/vsprintf.c:643 [inline]
 string+0x204/0x290 lib/vsprintf.c:725
 vsnprintf+0x10db/0x1c20 lib/vsprintf.c:2805
 add_uevent_var+0x1cd/0x460 lib/kobject_uevent.c:680
 rc_dev_uevent+0x15b/0x190 drivers/media/rc/rc-main.c:1631
 dev_uevent+0x4d6/0x740 drivers/base/core.c:2622
 uevent_show+0x1a8/0x320 drivers/base/core.c:2671
 dev_attr_show+0x50/0xb0 drivers/base/core.c:2372
 sysfs_kf_seq_show+0x349/0x4b0 fs/sysfs/file.c:59
 seq_read_iter+0x460/0xc50 fs/seq_file.c:230
 call_read_iter include/linux/fs.h:2259 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x471/0x960 fs/read_write.c:470
 ksys_read+0x14d/0x260 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2e1b2a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd6afd9bf0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f2e1ba8e880 RCX: 00007f2e1b2a7407
RDX: 0000000000001000 RSI: 000055b690c82550 RDI: 000000000000000c
RBP: 00007f2e1b3efff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000a
R13: 00007f2e1b3efea0 R14: 0000000000000000 R15: 000055b690c5f280
 </TASK>
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/05 02:30 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel panic: KASAN: panic_on_warn set ...
2026/08/04 22:34 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel panic: KASAN: panic_on_warn set ...
2026/08/04 22:34 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan kernel panic: KASAN: panic_on_warn set ...
* Struck through repros no longer work on HEAD.