INFO: task syz.4.1206:13136 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1206 state:D stack:23176 pid:13136 tgid:13070 ppid:11644 task_flags:0x440140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:268 [inline]
__down_common+0x319/0x6a0 kernel/locking/semaphore.c:293
down+0x80/0xd0 kernel/locking/semaphore.c:100
xfs_buf_lock+0x15d/0x4d0 fs/xfs/xfs_buf.c:993
xfs_buf_find_lock+0x42/0x4c0 fs/xfs/xfs_buf.c:419
xfs_buf_lookup fs/xfs/xfs_buf.c:472 [inline]
xfs_buf_get_map+0x10cf/0x1840 fs/xfs/xfs_buf.c:594
xfs_buf_read_map+0x82/0xa50 fs/xfs/xfs_buf.c:699
xfs_trans_read_buf_map+0x1d7/0x8e0 fs/xfs/xfs_trans_buf.c:304
xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline]
xfs_read_agf+0x281/0x5c0 fs/xfs/libxfs/xfs_alloc.c:3376
xfs_alloc_read_agf+0x17c/0xb70 fs/xfs/libxfs/xfs_alloc.c:3411
xfs_alloc_fix_freelist+0x60a/0x1300 fs/xfs/libxfs/xfs_alloc.c:2875
xfs_free_extent_fix_freelist+0x13e/0x240 fs/xfs/libxfs/xfs_alloc.c:3990
xfs_rmap_finish_init_cursor+0xae/0x210 fs/xfs/libxfs/xfs_rmap.c:2645
xfs_rmap_finish_one+0x2a2/0x710 fs/xfs/libxfs/xfs_rmap.c:2708
xfs_rmap_update_finish_item+0x25/0x40 fs/xfs/xfs_rmap_item.c:437
xfs_defer_finish_one+0x5c8/0xcf0 fs/xfs/libxfs/xfs_defer.c:595
xfs_defer_finish_noroll+0x910/0x12d0 fs/xfs/libxfs/xfs_defer.c:707
xfs_trans_commit+0x10b/0x1c0 fs/xfs/xfs_trans.c:921
xfs_iomap_write_unwritten+0x554/0xa70 fs/xfs/xfs_iomap.c:697
xfs_dio_write_end_io+0x4df/0x700 fs/xfs/xfs_file.c:587
iomap_dio_complete+0x145/0x980 fs/iomap/direct-io.c:97
xfs_file_dio_write_aligned+0x157/0x1b0 fs/xfs/xfs_file.c:696
xfs_file_dio_write fs/xfs/xfs_file.c:907 [inline]
xfs_file_write_iter+0x8b2/0xa60 fs/xfs/xfs_file.c:1119
iter_file_splice_write+0x975/0x10e0 fs/splice.c:738
do_splice_from fs/splice.c:938 [inline]
direct_splice_actor+0x101/0x160 fs/splice.c:1161
splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1105
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1230
do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1431 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98e0b8eec9
RSP: 002b:00007f98e1a40038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f98e0de6090 RCX: 00007f98e0b8eec9
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000009
RBP: 00007f98e0c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98e0de6128 R14: 00007f98e0de6090 R15: 00007ffe605e1118
INFO: task syz.4.1206:13141 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1206 state:D stack:28904 pid:13141 tgid:13070 ppid:11644 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1798/0x4cc0 kernel/sched/core.c:6964
__schedule_loop kernel/sched/core.c:7046 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7061
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7118
rwsem_down_write_slowpath+0x872/0xfe0 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591
inode_lock include/linux/fs.h:980 [inline]
do_lock_mount+0x29f/0x930 fs/namespace.c:2749
do_loopback+0x27e/0x410 fs/namespace.c:2990
do_mount fs/namespace.c:4048 [inline]
__do_sys_mount fs/namespace.c:4236 [inline]
__se_sys_mount+0x313/0x410 fs/namespace.c:4213
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98e0b8eec9
RSP: 002b:00007f98e19fe038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f98e0de6270 RCX: 00007f98e0b8eec9
RDX: 0000000000000000 RSI: 0000200000000140 RDI: 0000200000000280
RBP: 00007f98e0c11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98e0de6308 R14: 00007f98e0de6270 R15: 00007ffe605e1118
Showing all locks held in the system:
2 locks held by ksoftirqd/0/15:
1 lock held by khungtaskd/31:
#0: ffffffff8e33d360 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e33d360 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e33d360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5624:
#0: ffff88814db040a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
4 locks held by syz.4.1206/13136:
#0: ffff888031264420 (sb_writers#17){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1160
#1: ffff8880763099b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: xfs_ilock_demote+0xbd/0x2b0 fs/xfs/xfs_inode.c:285
#2: ffff888031264610 (sb_internal#2){.+.+}-{0:0}, at: xfs_trans_alloc+0xd7/0x980 fs/xfs/xfs_trans.c:256
#3: ffff888076309798 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_trans_alloc_inode+0x161/0x4a0 fs/xfs/xfs_trans.c:1082
1 lock held by syz.4.1206/13141:
#0: ffff8880763099b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline]
#0: ffff8880763099b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: do_lock_mount+0x29f/0x930 fs/namespace.c:2749
4 locks held by syz.4.1206/13142:
#0: ffff888031264420 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508
#1: ffff88804cc4d5b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline]
#1: ffff88804cc4d5b0 (&sb->s_type->i_mutex_key#23){++++}-{4:4}, at: vfs_setxattr+0x144/0x2f0 fs/xattr.c:320
#2: ffff888031264610 (sb_internal#2){.+.+}-{0:0}, at: xfs_trans_alloc+0xd7/0x980 fs/xfs/xfs_trans.c:256
#3: ffff88804cc4d398 (&xfs_nondir_ilock_class){++++}-{4:4}, at: xfs_trans_alloc_inode+0x161/0x4a0 fs/xfs/xfs_trans.c:1082
4 locks held by rm/16167:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf60/0xfa0 kernel/hung_task.c:495
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:crng_make_state+0x413/0x700 drivers/char/random.c:394
Code: d3 51 67 fc e8 0e 3d 25 06 4d 85 f6 74 8c e8 c4 51 67 fc fb 48 c7 44 24 40 0e 36 e0 45 48 8b 44 24 38 4a c7 04 20 00 00 00 00 <66> 42 c7 44 20 09 00 00 42 c6 44 20 0b 00 65 48 8b 05 e7 ca 68 0d
RSP: 0018:ffffc90000117720 EFLAGS: 00000293
RAX: 1ffff92000022eec RBX: 0000000000000000 RCX: ffff88801d2fdac0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000117810 R08: ffffffff8fc34077 R09: 1ffffffff1f8680e
R10: dffffc0000000000 R11: fffffbfff1f8680f R12: dffffc0000000000
R13: ffff8880b8736390 R14: 0000000000000200 R15: ffff8880b87363e0
FS: 0000000000000000(0000) GS:ffff888125b03000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43ecf807e8 CR3: 0000000045bd6000 CR4: 00000000003526f0
Call Trace:
_get_random_bytes+0xd5/0x210 drivers/char/random.c:406
eth_random_addr include/linux/etherdevice.h:238 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:770 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]
nsim_dev_trap_report_work+0x35d/0xb80 drivers/net/netdevsim/dev.c:866
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245