syzbot


WARNING in __mod_timer

Status: fixed on 2023/06/08 14:41
Subsystems: keyrings lsm
[Documentation on labels]
Reported-by: syzbot+5093ba19745994288b53@syzkaller.appspotmail.com
Fix commit: 63a759694eed debugobject: Prevent init race with static objects
First crash: 484d, last: 446d
Discussions (3)
Title Replies (including bot) Last reply
[PATCH 1/2] debugobject: fix concurrency issues with is_static_object 24 (24) 2023/05/02 05:53
[PATCH v2 1/2] debugobject: fix concurrency issues with is_static_object 4 (4) 2023/03/04 10:16
[syzbot] [keyrings?] [lsm?] WARNING in __mod_timer 3 (4) 2023/02/28 01:59
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in __mod_timer C done 1 84d 84d 3/3 fixed on 2024/04/29 07:11
upstream WARNING in __mod_timer (2) usb 2 71d 72d 0/27 upstream: reported on 2024/04/10 19:08

Sample crash report:
------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object: ffffffff8d4fcbc0 object type: timer_list hint: key_gc_timer_func+0x0/0x80 security/keys/gc.c:117
WARNING: CPU: 1 PID: 10646 at lib/debugobjects.c:512 debug_print_object lib/debugobjects.c:509 [inline]
WARNING: CPU: 1 PID: 10646 at lib/debugobjects.c:512 debug_object_assert_init+0x1f2/0x240 lib/debugobjects.c:899
Modules linked in:
CPU: 1 PID: 10646 Comm: syz-executor.3 Not tainted 6.2.0-syzkaller-06695-gd8ca6dbb8de7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
RIP: 0010:debug_print_object lib/debugobjects.c:509 [inline]
RIP: 0010:debug_object_assert_init+0x1f2/0x240 lib/debugobjects.c:899
Code: a0 fd 4c 8b 4d 00 48 c7 c7 20 68 38 8b 48 c7 c6 00 65 38 8b 48 c7 c2 e0 69 38 8b 31 c9 4d 89 e8 53 e8 42 6f 10 fd 48 83 c4 08 <0f> 0b ff 05 42 e1 10 0a 48 83 c5 38 48 89 e8 48 c1 e8 03 42 80 3c
RSP: 0018:ffffc9000b1276f8 EFLAGS: 00010282
RAX: caefb79dfa053800 RBX: ffffffff83f63700 RCX: 0000000000040000
RDX: ffffc90014421000 RSI: 0000000000018ba9 RDI: 0000000000018baa
RBP: ffffffff8aec5400 R08: ffffffff81536d42 R09: fffff52001624e55
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffffff8d4fcbc0 R14: 0000000000000004 R15: ffffffff91d3e4e8
FS:  00007f122cc29700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555632f708 CR3: 00000000690df000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 debug_timer_assert_init kernel/time/timer.c:792 [inline]
 debug_assert_init kernel/time/timer.c:837 [inline]
 __mod_timer+0x10d/0xf40 kernel/time/timer.c:1020
 key_reject_and_link+0x3f5/0x6e0 security/keys/key.c:610
 key_negate_and_link include/linux/key-type.h:187 [inline]
 complete_request_key security/keys/request_key.c:64 [inline]
 call_sbin_request_key+0xa7b/0xcd0 security/keys/request_key.c:213
 construct_key security/keys/request_key.c:244 [inline]
 construct_key_and_link security/keys/request_key.c:503 [inline]
 request_key_and_link+0x11e3/0x18e0 security/keys/request_key.c:637
 __do_sys_request_key security/keys/keyctl.c:222 [inline]
 __se_sys_request_key+0x271/0x3b0 security/keys/keyctl.c:167
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f122be8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f122cc29168 EFLAGS: 00000246 ORIG_RAX: 00000000000000f9
RAX: ffffffffffffffda RBX: 00007f122bfabf80 RCX: 00007f122be8c0f9
RDX: 00000000200016c0 RSI: 0000000020001680 RDI: 0000000020001640
RBP: 00007f122bee7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000a0c74db R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcdaafcfef R14: 00007f122cc29300 R15: 0000000000022000
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/23 03:50 upstream d8ca6dbb8de7 409945bc .config console log report info ci-upstream-kasan-gce-smack-root WARNING in __mod_timer
2023/04/02 20:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 59caa87f9dfb f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in __mod_timer
* Struck through repros no longer work on HEAD.