INFO: task syz.4.5024:16124 blocked for more than 143 seconds.
Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.5024 state:D stack:24000 pid:16124 tgid:16124 ppid:5965 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5373 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6760
__schedule_loop kernel/sched/core.c:6837 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6852
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6909
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
ima_check_last_writer security/integrity/ima/ima_main.c:166 [inline]
ima_file_free+0x17f/0x4d0 security/integrity/ima/ima_main.c:205
security_file_release+0x92/0x140 security/security.c:2876
__fput+0x35a/0x9f0 fs/file_table.c:458
task_work_run+0x24f/0x310 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa83fd8d169
RSP: 002b:00007fff3c6f5428 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fa83ffa7ba0 RCX: 00007fa83fd8d169
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fa83ffa7ba0 R08: 0000000000000000 R09: 0000000d3c6f571f
R10: 00007fa83ffa7ac0 R11: 0000000000000246 R12: 00000000000439c4
R13: 00007fa83ffa6080 R14: ffffffffffffffff R15: 00007fff3c6f5540
Showing all locks held in the system:
3 locks held by kworker/1:0/23:
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
#0: ffff88801b080d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3319
#1: ffffc900001d7c60 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
#1: ffffc900001d7c60 ((fqdir_free_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3319
#2: ffffffff8eb40780 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:3772
1 lock held by khungtaskd/30:
#0: ffffffff8eb3b3a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8eb3b3a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8eb3b3a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
1 lock held by udevd/5204:
2 locks held by getty/5591:
#0: ffff88814d6100a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
1 lock held by syz.4.5024/16124:
#0: ffff888032976178 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_check_last_writer security/integrity/ima/ima_main.c:166 [inline]
#0: ffff888032976178 (&ima_iint_mutex_key[depth]){+.+.}-{4:4}, at: ima_file_free+0x17f/0x4d0 security/integrity/ima/ima_main.c:205
1 lock held by syz.4.5024/16127:
1 lock held by syz-executor/17729:
4 locks held by syz-executor/19188:
8 locks held by syz-executor/23511:
#0: ffff888032c10420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3033 [inline]
#0: ffff888032c10420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x225/0xd10 fs/read_write.c:680
#1: ffff888052eb1488 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1ef/0x510 fs/kernfs/file.c:325
#2: ffff888027f3ca58 (kn->active#55){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x213/0x510 fs/kernfs/file.c:326
#3: ffffffff8f7865a8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
#4: ffff888027ad70e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#4: ffff888027ad70e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
#4: ffff888027ad70e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1293
#5: ffff888027ad2250 (&devlink->lock_key#10){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1675
#6: ffffffff8fee0408 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0xa4/0x620 drivers/net/netdevsim/netdev.c:1014
#7: ffffffff8eb408b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline]
#7: ffffffff8eb408b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x820 kernel/rcu/tree_exp.h:998
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 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: 24712 Comm: syz-executor Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:unwind_next_frame+0x18c9/0x2380 arch/x86/kernel/unwind_orc.c:665
Code: 85 3d 08 00 00 40 b5 01 48 8b 1c 24 8b 84 24 94 00 00 00 39 03 4c 8b 7c 24 48 0f 85 66 01 00 00 48 8b 44 24 50 42 80 3c 28 00 <74> 0d 48 8b bc 24 80 00 00 00 e8 c8 18 bc 00 4c 8b 73 38 48 8d 7b
RSP: 0018:ffffc9000cbbf608 EFLAGS: 00000246
RAX: 1ffff92001977ee3 RBX: ffffc9000cbbf6e0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffc9000cbb8000 RDI: ffffc9000cbbfd90
RBP: dffffc0000000001 R08: ffffc9000cbbfd90 R09: 0000000000000000
R10: ffffc9000cbbf730 R11: fffff52001977ee8 R12: ffffc9000cbbf6e0
R13: dffffc0000000000 R14: ffffffff90d25bd0 R15: ffffffff816d4f98
FS: 000055558cbc2500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5cfb04aea3 CR3: 000000007098e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4129 [inline]
slab_alloc_node mm/slub.c:4178 [inline]
kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4185
lsm_inode_alloc security/security.c:755 [inline]
security_inode_alloc+0x37/0x310 security/security.c:1697
inode_init_always_gfp+0xa0f/0xd90 fs/inode.c:306
inode_init_always include/linux/fs.h:3218 [inline]
alloc_inode+0xa3/0x1b0 fs/inode.c:353
new_inode+0x22/0x1d0 fs/inode.c:1188
__shmem_get_inode mm/shmem.c:3024 [inline]
shmem_get_inode+0x39d/0xf20 mm/shmem.c:3098
shmem_symlink+0x129/0x6c0 mm/shmem.c:4073
vfs_symlink+0x137/0x2e0 fs/namei.c:4659
do_symlinkat+0x222/0x3a0 fs/namei.c:4685
__do_sys_symlinkat fs/namei.c:4701 [inline]
__se_sys_symlinkat fs/namei.c:4698 [inline]
__x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4698
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5cfaf8c6e7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0a 01 00 00 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:00007ffe52ccd158 EFLAGS: 00000202 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5cfaf8c6e7
RDX: 00007f5cfb00fb16 RSI: 00000000ffffff9c RDI: 00007ffe52ccd1f0
RBP: 00007ffe52ccd19c R08: 0000000000000013 R09: 00007ffe52cccea7
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000002ad
R13: 00000000000927c0 R14: 0000000000069f3c R15: 00007ffe52ccd1f0