INFO: task syz.0.342:6795 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.342 state:D stack:26536 pid:6795 tgid:6794 ppid:5842 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
io_schedule+0xbf/0x130 kernel/sched/core.c:7903
folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3124
__filemap_fdatawait_range+0x11f/0x200 mm/filemap.c:539
filemap_fdatawait_keep_errors+0x21/0x30 mm/filemap.c:633
wait_sb_inodes fs/fs-writeback.c:2715 [inline]
sync_inodes_sb+0x5fa/0xa70 fs/fs-writeback.c:2837
sync_inodes_one_sb+0x52/0x60 fs/sync.c:77
__iterate_supers+0x20d/0x360 fs/super.c:924
ksys_sync+0x89/0x150 fs/sync.c:102
__do_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f144218eba9
RSP: 002b:00007f1442f9a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f14423d5fa0 RCX: 00007f144218eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f14423d5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14423d6038 R14: 00007f14423d5fa0 R15: 00007ffdce438208
INFO: task syz.0.342:6796 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.342 state:D stack:29112 pid:6796 tgid:6794 ppid:5842 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
wait_sb_inodes fs/fs-writeback.c:2654 [inline]
sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
sync_inodes_one_sb+0x52/0x60 fs/sync.c:77
__iterate_supers+0x20d/0x360 fs/super.c:924
ksys_sync+0x89/0x150 fs/sync.c:102
__do_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f144218eba9
RSP: 002b:00007f1442f79038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f14423d6090 RCX: 00007f144218eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f14423d6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14423d6128 R14: 00007f14423d6090 R15: 00007ffdce438208
INFO: task syz.0.342:6797 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.342 state:D stack:29112 pid:6797 tgid:6794 ppid:5842 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
wait_sb_inodes fs/fs-writeback.c:2654 [inline]
sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
sync_inodes_one_sb+0x52/0x60 fs/sync.c:77
__iterate_supers+0x20d/0x360 fs/super.c:924
ksys_sync+0x89/0x150 fs/sync.c:102
__do_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f144218eba9
RSP: 002b:00007f1442f58038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f14423d6180 RCX: 00007f144218eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f14423d6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14423d6218 R14: 00007f14423d6180 R15: 00007ffdce438208
INFO: task syz.0.342:6800 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.342 state:D stack:29112 pid:6800 tgid:6794 ppid:5842 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
wait_sb_inodes fs/fs-writeback.c:2654 [inline]
sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
sync_inodes_one_sb+0x52/0x60 fs/sync.c:77
__iterate_supers+0x20d/0x360 fs/super.c:924
ksys_sync+0x89/0x150 fs/sync.c:102
__do_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f144218eba9
RSP: 002b:00007f1442f37038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f14423d6270 RCX: 00007f144218eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f14423d6270 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14423d6308 R14: 00007f14423d6270 R15: 00007ffdce438208
INFO: task syz.0.342:6805 blocked for more than 145 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.342 state:D stack:29112 pid:6805 tgid:6794 ppid:5842 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
__mutex_lock_common kernel/locking/mutex.c:676 [inline]
__mutex_lock+0x81b/0x1060 kernel/locking/mutex.c:760
wait_sb_inodes fs/fs-writeback.c:2654 [inline]
sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
sync_inodes_one_sb+0x52/0x60 fs/sync.c:77
__iterate_supers+0x20d/0x360 fs/super.c:924
ksys_sync+0x89/0x150 fs/sync.c:102
__do_sys_sync+0xe/0x20 fs/sync.c:113
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f144218eba9
RSP: 002b:00007f143fbf2038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f14423d6360 RCX: 00007f144218eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f14423d6360 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14423d63f8 R14: 00007f14423d6360 R15: 00007ffdce438208
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e5c1260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c1260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c1260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/5602:
#0: ffff8880363ee0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by syz.2.261/6589:
#0: ffff888056b02428 (sb_writers#15){.+.+}-{0:0}, at: do_pwritev+0x1a6/0x270 fs/read_write.c:1153
#1: ffff8880573e9498 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: netfs_start_io_write+0x59/0x80 fs/netfs/locking.c:112
#2: ffff8880573e9850 (&ctx->wb_lock){+.+.}-{4:4}, at: netfs_begin_writethrough+0x64/0x1c0 fs/netfs/write_issue.c:626
2 locks held by syz.0.342/6795:
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2654 [inline]
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
2 locks held by syz.0.342/6796:
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2654 [inline]
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
2 locks held by syz.0.342/6797:
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2654 [inline]
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
2 locks held by syz.0.342/6800:
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2654 [inline]
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
2 locks held by syz.0.342/6805:
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline]
#0: ffff888056b020e0 (&type->s_umount_key#67){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2654 [inline]
#1: ffff888056b02950 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x231/0xa70 fs/fs-writeback.c:2837
1 lock held by syz.3.1744/10563:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf0e/0x1260 kernel/hung_task.c:491
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10563 Comm: syz.3.1744 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:set_normalized_timespec64+0x1d/0xc0 kernel/time/time.c:504
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 da a3 14 00 eb 10 e8 d3 a3 14 00 <48> 81 eb 00 ca 9a 3b 48 83 c5 01 48 89 de bf ff c9 9a 3b e8 2b 9f
RSP: 0018:ffffc900046afb08 EFLAGS: 00000246
RAX: 0000000000080000 RBX: 41587eeb7ce1bf61 RCX: ffffc9000d13b000
RDX: 0000000000080000 RSI: ffffffff81a6eafd RDI: 0000000000000007
RBP: 61616161eaf7e95e R08: 0000000000000007 R09: 000000003b9ac9ff
R10: 41587eeb7ce1bf61 R11: 0000000000000000 R12: ffffc900046afb50
R13: 1ffff920008d5f66 R14: ffffc900046afb58 R15: dffffc0000000000
FS: 00007f7ee00376c0(0000) GS:ffff8881246b5000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffde4f62fb8 CR3: 0000000058e54000 CR4: 00000000003526f0
Call Trace:
inode_set_ctime_to_ts+0xca/0x1f0 fs/inode.c:2665
inode_set_ctime include/linux/fs.h:1779 [inline]
v9fs_stat2inode_dotl+0x6e1/0xd30 fs/9p/vfs_inode_dotl.c:656
v9fs_qid_iget_dotl fs/9p/vfs_inode_dotl.c:128 [inline]
v9fs_inode_from_fid_dotl+0x249/0x2f0 fs/9p/vfs_inode_dotl.c:154
v9fs_get_new_inode_from_fid fs/9p/v9fs.h:251 [inline]
v9fs_mount+0x4fd/0xa90 fs/9p/vfs_super.c:144
legacy_get_tree+0x10c/0x220 fs/fs_context.c:666
vfs_get_tree+0x8b/0x340 fs/super.c:1815
do_new_mount fs/namespace.c:3808 [inline]
path_mount+0x1513/0x2000 fs/namespace.c:4123
do_mount fs/namespace.c:4136 [inline]
__do_sys_mount fs/namespace.c:4347 [inline]
__se_sys_mount fs/namespace.c:4324 [inline]
__x64_sys_mount+0x28d/0x310 fs/namespace.c:4324
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7edf18eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7ee0037038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f7edf3d5fa0 RCX: 00007f7edf18eba9
RDX: 00002000000003c0 RSI: 0000200000000500 RDI: 0000000000000000
RBP: 00007f7edf211e19 R08: 0000200000000600 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7edf3d6038 R14: 00007f7edf3d5fa0 R15: 00007fff98b61258