WARNING in __thaw_task

Status: upstream: reported on 2026/07/29 00:52
Reported-by: syzbot+a6699d1bd656dfe15088@syzkaller.appspotmail.com
First crash: 81d, last: 5d14h

Sample crash report:
RDX: 0000000000090800 RSI: 00007fffa0168670 RDI: 00000000ffffff9c
RBP: 00007fffa0168670 R08: 00007fffa0169670 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000206 R12: 00007fffa0168670
R13: 00007f51b2a34ccb R14: 000000000005baea R15: 00007fffa016a830
 </TASK>
OOM killer enabled.
Restarting tasks ... 
------------[ cut here ]------------
WARNING: CPU: 0 PID: 18610 at kernel/freezer.c:199 freezing_slow_path kernel/freezer.c:46 [inline]
WARNING: CPU: 0 PID: 18610 at kernel/freezer.c:199 freezing include/linux/freezer.h:37 [inline]
WARNING: CPU: 0 PID: 18610 at kernel/freezer.c:199 __thaw_task+0x23b/0x2e0 kernel/freezer.c:199
Modules linked in:
CPU: 0 PID: 18610 Comm: syz.9.3842 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:__thaw_task+0x23b/0x2e0 kernel/freezer.c:199
Code: 4c 8b 6c 24 18 e9 ff fe ff ff e8 d0 8d 11 00 4c 8b 6c 24 18 e9 68 fe ff ff 4c 89 f7 e8 8e 40 0b 00 84 c0 74 11 e8 b5 8d 11 00 <0f> 0b 4c 8b 6c 24 18 e9 d3 fe ff ff f6 05 02 4a 37 16 01 74 41 48
RSP: 0018:ffffc9000ed07b20 EFLAGS: 00010046
RAX: ffffffff8170b8cb RBX: 1ffff92001da0f68 RCX: 0000000000080000
RDX: ffffc90011e25000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc9000ed07bd8 R08: ffffffff8f00d22f R09: 1ffffffff1e01a45
R10: dffffc0000000000 R11: fffffbfff1e01a46 R12: 1ffff1100c1b4785
R13: ffff888060da3c2c R14: ffff888060da3c00 R15: 0000000000000000
FS:  00007fe804c536c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558c8817d0 CR3: 0000000040829000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 thaw_processes+0x1ba/0x3a0 kernel/power/process.c:203
 freeze_processes+0x15b/0x1e0 kernel/power/process.c:153
 suspend_freeze_processes kernel/power/power.h:257 [inline]
 suspend_prepare kernel/power/suspend.c:372 [inline]
 enter_state kernel/power/suspend.c:589 [inline]
 pm_suspend+0x289/0x9a0 kernel/power/suspend.c:626
 state_store+0x202/0x290 kernel/power/main.c:639
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2271 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 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: 0033:0x7fe803d9e1d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe804c53028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe804025fa0 RCX: 00007fe803d9e1d9
RDX: 0000000000000003 RSI: 0000200000000180 RDI: 0000000000000003
RBP: 00007fe803e35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe804026038 R14: 00007fe804025fa0 R15: 00007ffd90a8e8a8
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/12 17:45 linux-6.1.y a500ba24937a 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __thaw_task
2026/10/09 01:40 linux-6.1.y a500ba24937a b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __thaw_task
2026/07/29 00:51 linux-6.1.y dc5c83b7f5f8 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __thaw_task
* Struck through repros no longer work on HEAD.