INFO: task kworker/1:2H:6075 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2H state:D stack:26312 pid:6075 ppid:2 flags:0x00004000
Workqueue: xfs-log/loop4 xlog_ioend_work
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_timeout+0xc1/0x2d0 kernel/time/timer.c:2144
___down_common kernel/locking/semaphore.c:229 [inline]
__down_common+0x31a/0x670 kernel/locking/semaphore.c:250
down+0x80/0xd0 kernel/locking/semaphore.c:64
xfs_buf_lock+0x14d/0x460 fs/xfs/xfs_buf.c:1126
xfs_buf_item_unpin+0x1bd/0x650 fs/xfs/xfs_buf_item.c:582
xfs_trans_committed_bulk+0x389/0x8b0 fs/xfs/xfs_trans.c:808
xlog_cil_committed+0x223/0x5e0 fs/xfs/xfs_log_cil.c:733
xlog_cil_process_committed+0x15c/0x1a0 fs/xfs/xfs_log_cil.c:765
xlog_state_shutdown_callbacks+0x278/0x370 fs/xfs/xfs_log.c:538
xlog_force_shutdown+0x2c9/0x320 fs/xfs/xfs_log.c:3807
xlog_ioend_work+0xaf/0x100 fs/xfs/xfs_log.c:1395
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
INFO: task syz.4.1179:10638 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1179 state:D stack:24520 pid:10638 ppid:6182 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
xlog_wait fs/xfs/xfs_log_priv.h:622 [inline]
xlog_wait_on_iclog+0x474/0x680 fs/xfs/xfs_log.c:892
xlog_force_lsn+0x4c9/0x940 fs/xfs/xfs_log.c:3342
xfs_log_force_seq+0x1c3/0x430 fs/xfs/xfs_log.c:3379
__xfs_trans_commit+0x966/0xd90 fs/xfs/xfs_trans.c:1013
xfs_sync_sb_buf+0xfd/0x190 fs/xfs/libxfs/xfs_sb.c:1164
xfs_ioc_setlabel fs/xfs/xfs_ioctl.c:1823 [inline]
xfs_file_ioctl+0x1529/0x17c0 fs/xfs/xfs_ioctl.c:1921
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa4e439ce59
RSP: 002b:00007fa4e533a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa4e4615fa0 RCX: 00007fa4e439ce59
RDX: 00002000000001c0 RSI: 0000000041009432 RDI: 0000000000000006
RBP: 00007fa4e4432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa4e4616038 R14: 00007fa4e4615fa0 R15: 00007ffcec6b8df8
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:3/49:
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc90000ba7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc90000ba7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
2 locks held by kworker/0:2/971:
2 locks held by kworker/u4:8/1129:
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000478fd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000478fd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
2 locks held by kworker/u4:9/1146:
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc900049afd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc900049afd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
2 locks held by getty/5533:
#0: ffff8880310020a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000328b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
2 locks held by kworker/1:2H/6075:
#0: ffff888030358938 ((wq_completion)xfs-log/loop4){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888030358938 ((wq_completion)xfs-log/loop4){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000443fd00 ((work_completion)(&iclog->ic_end_io_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000443fd00 ((work_completion)(&iclog->ic_end_io_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
2 locks held by kworker/u4:11/8693:
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff888018ba2938 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc90003447d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc90003447d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
1 lock held by syz.4.1179/10638:
#0: ffff888059afc418 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x200 fs/namespace.c:456
1 lock held by syz-executor/11332:
#0: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#0: ffffffff8d137b38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004
1 lock held by syz.0.1550/13047:
#0: ffff888063a8e2b8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nf_tables_valid_genid+0x3b/0x100 net/netfilter/nf_tables_api.c:10853
2 locks held by syz.0.1550/13048:
#0: ffffffff976a36b8 (nfnl_subsys_nftables){+.+.}-{3:3}, at: nfnl_lock net/netfilter/nfnetlink.c:98 [inline]
#0: ffffffff976a36b8 (nfnl_subsys_nftables){+.+.}-{3:3}, at: nfnetlink_rcv_batch net/netfilter/nfnetlink.c:392 [inline]
#0: ffffffff976a36b8 (nfnl_subsys_nftables){+.+.}-{3:3}, at: nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:639 [inline]
#0: ffffffff976a36b8 (nfnl_subsys_nftables){+.+.}-{3:3}, at: nfnetlink_rcv+0x662/0x24a0 net/netfilter/nfnetlink.c:657
#1: ffff888063a8e2b8 (&nft_net->commit_mutex){+.+.}-{3:3}, at: nf_tables_valid_genid+0x3b/0x100 net/netfilter/nf_tables_api.c:10853
2 locks held by cmp/13061:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11332 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x89/0x290 mm/kasan/generic.c:187
Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 8d 01 00 00 49 ff c3 48 ff c3 75 ee e9 1d 01 00 00 44 89 dd
RSP: 0018:ffffc900043bfcc8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffffffffffff RCX: ffffffff81f50865
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000745e48
RBP: dffffc0000000000 R08: ffffc90000745e4f R09: 1ffff920000e8bc9
R10: dffffc0000000000 R11: fffff520000e8bc9 R12: 0000000000000001
R13: dffffc0000000000 R14: fffff520000e8bca R15: 1ffff920000e8bc9
FS: 0000555565d91500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff40d71afe8 CR3: 000000004c06a000 CR4: 00000000003506f0
Call Trace:
instrument_atomic_read_write include/linux/instrumented.h:96 [inline]
test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:57 [inline]
bit_spin_lock include/linux/bit_spinlock.h:27 [inline]
hlist_bl_lock+0x25/0x110 include/linux/list_bl.h:148
___d_drop+0x91/0x240 fs/dcache.c:503
__d_drop fs/dcache.c:511 [inline]
__dentry_kill+0x1ed/0x650 fs/dcache.c:606
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfe/0x1e0 fs/dcache.c:918
do_rmdir+0x2aa/0x590 fs/namei.c:4265
__do_sys_unlinkat fs/namei.c:4441 [inline]
__se_sys_unlinkat fs/namei.c:4435 [inline]
__x64_sys_unlinkat+0xc4/0xe0 fs/namei.c:4435
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f60f619bf77
Code: 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 07 01 00 00 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:00007fffc1f5e2f8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f60f619bf77
RDX: 0000000000000200 RSI: 00007fffc1f5f440 RDI: 00000000ffffff9c
RBP: 00007f60f62321ca R08: 00000000000185d0 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000207 R12: 00007fffc1f5f440
R13: 00007f60f62321ca R14: 00000000000aa360 R15: 00007fffc1f5f480