syzbot


BUG: sleeping function called from invalid context in gfs2_withdraw

Status: upstream: reported on 2025/07/30 20:12
Reported-by: syzbot+3cdbdd888aae950489a5@syzkaller.appspotmail.com
First crash: 31d, last: 21d
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 BUG: sleeping function called from invalid context in gfs2_withdraw origin:upstream 5 C error 10 7d01h 161d 0/3 upstream: reported C repro on 2025/03/23 18:44
upstream BUG: sleeping function called from invalid context in gfs2_withdraw gfs2 5 C error done 182 600d 721d 25/29 fixed on 2024/03/20 11:33

Sample crash report:
syz-executor: attempt to access beyond end of device
loop2: rw=1, sector=320, nr_sectors = 8 limit=64
gfs2: fsid=syz:syz.0: Error 10 writing to journal, jid=0
gfs2: fsid=syz:syz.0: fatal: I/O error(s)
gfs2: fsid=syz:syz.0: about to withdraw this file system
BUG: sleeping function called from invalid context at fs/gfs2/util.c:159
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5787, name: syz-executor
preempt_count: 1, expected: 0
RCU nest depth: 0, expected: 0
4 locks held by syz-executor/5787:
 #0: ffff88807a77c0e0 (&type->s_umount_key#69){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807a77c0e0 (&type->s_umount_key#69){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807a77c0e0 (&type->s_umount_key#69){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
 #1: ffff88801ef5d060 (&sdp->sd_log_flush_lock){++++}-{3:3}, at: gfs2_log_flush+0x104/0x24b0 fs/gfs2/log.c:1042
 #2: ffff88801ef5ce88 (&sdp->sd_log_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff88801ef5ce88 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_log_lock fs/gfs2/log.h:32 [inline]
 #2: ffff88801ef5ce88 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_flush_revokes+0x52/0x80 fs/gfs2/log.c:814
 #3: ffff88801ef5d248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: signal_our_withdraw fs/gfs2/util.c:152 [inline]
 #3: ffff88801ef5d248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: gfs2_withdraw+0x413/0x14b0 fs/gfs2/util.c:342
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 0 PID: 5787 Comm: syz-executor Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 __might_resched+0x491/0x610 kernel/sched/core.c:10209
 signal_our_withdraw fs/gfs2/util.c:157 [inline]
 gfs2_withdraw+0x461/0x14b0 fs/gfs2/util.c:342
 gfs2_ail1_empty+0x7be/0x850 fs/gfs2/log.c:377
 gfs2_flush_revokes+0x5c/0x80 fs/gfs2/log.c:815
 revoke_lo_before_commit+0x2c/0x5f0 fs/gfs2/lops.c:867
 lops_before_commit fs/gfs2/lops.h:42 [inline]
 gfs2_log_flush+0xb84/0x24b0 fs/gfs2/log.c:1102
 gfs2_kill_sb+0x5d/0x320 fs/gfs2/ops_fstype.c:1789
 deactivate_locked_super+0x97/0x100 fs/super.c:481
 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc8a618ff17
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd0e436ac8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000064 RCX: 00007fc8a618ff17
RDX: 0000000000000200 RSI: 0000000000000009 RDI: 00007ffd0e437c70
RBP: 00007fc8a6211c05 R08: 000055558999b663 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffd0e437c70
R13: 00007fc8a6211c05 R14: 00005555899804a8 R15: 00007ffd0e438d40
 </TASK>
BUG: scheduling while atomic: syz-executor/5787/0x00000002
4 locks held by syz-executor/5787:
 #0: ffff88807a77c0e0 (&type->s_umount_key#69){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88807a77c0e0 (&type->s_umount_key#69){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88807a77c0e0 (&type->s_umount_key#69){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
 #1: ffff88801ef5d060 (&sdp->sd_log_flush_lock){++++}-{3:3}, at: gfs2_log_flush+0x104/0x24b0 fs/gfs2/log.c:1042
 #2: ffff88801ef5ce88 (&sdp->sd_log_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff88801ef5ce88 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_log_lock fs/gfs2/log.h:32 [inline]
 #2: ffff88801ef5ce88 (&sdp->sd_log_lock){+.+.}-{2:2}, at: gfs2_flush_revokes+0x52/0x80 fs/gfs2/log.c:814
 #3: ffff88801ef5d248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: signal_our_withdraw fs/gfs2/util.c:152 [inline]
 #3: ffff88801ef5d248 (&sdp->sd_freeze_mutex){+.+.}-{3:3}, at: gfs2_withdraw+0x413/0x14b0 fs/gfs2/util.c:342
Modules linked in:
Preemption disabled at:
[<0000000000000000>] 0x0

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/10 17:38 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
2025/08/10 17:36 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
2025/08/10 17:36 linux-6.6.y 3a8ababb8b6a 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
2025/07/30 20:26 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
2025/07/30 20:24 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
2025/07/30 20:16 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
2025/07/30 20:12 linux-6.6.y dbcb8d8e4163 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan BUG: sleeping function called from invalid context in gfs2_withdraw
* Struck through repros no longer work on HEAD.