INFO: task syz.1.1548:22047 blocked for more than 143 seconds.
Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1548 state:D stack:24576 pid:22047 tgid:22044 ppid:21422 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5188 [inline]
__schedule+0x17ae/0x4a10 kernel/sched/core.c:6529
__schedule_loop kernel/sched/core.c:6606 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6621
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
__fdget_pos+0x24e/0x310 fs/file.c:1187
fdget_pos include/linux/file.h:76 [inline]
ksys_lseek fs/read_write.c:296 [inline]
__do_sys_lseek fs/read_write.c:313 [inline]
__se_sys_lseek fs/read_write.c:311 [inline]
__x64_sys_lseek+0x7a/0x1e0 fs/read_write.c:311
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: 0033:0x7f7d5cd7cef9
RSP: 002b:00007f7d5dbfc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000008
RAX: ffffffffffffffda RBX: 00007f7d5cf35f80 RCX: 00007f7d5cd7cef9
RDX: 0000000000000002 RSI: fffffffffffffffc RDI: 0000000000000007
RBP: 00007f7d5cdef046 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7d5cf35f80 R15: 00007ffdcd0be7b8
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e738320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626
2 locks held by getty/4986:
#0: ffff88803042d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:2/13139:
1 lock held by syz.1.1548/22047:
#0: ffff888054b759c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x310 fs/file.c:1187
2 locks held by syz.1.1548/22053:
1 lock held by syz-executor/22893:
#0: ffffffff8e73d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline]
#0: ffffffff8e73d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958
1 lock held by syz.0.1717/23477:
#0: ffffffff8e73d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline]
#0: ffffffff8e73d6f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958
2 locks held by syz.1.1718/23479:
1 lock held by udevadm/23508:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
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:223 [inline]
watchdog+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 23508 Comm: udevadm Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:kfence_alloc include/linux/kfence.h:127 [inline]
RIP: 0010:slab_alloc_node mm/slub.c:4025 [inline]
RIP: 0010:kmem_cache_alloc_noprof+0x201/0x2a0 mm/slub.c:4048
Code: 89 f2 e8 22 b9 14 00 48 8b 1c 24 84 c0 75 84 4c 89 ef 48 89 de e8 ff a1 00 00 31 db e9 72 ff ff ff e8 33 26 c5 09 f3 0f 1e fa <83> 3d c8 92 98 0c 00 0f 85 76 fe ff ff 4c 89 ef 48 89 ee 44 89 f2
RSP: 0018:ffffc90003487518 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000018 RDI: ffffffff8e849120
RBP: 0000000000000018 R08: ffffffff81901ac5 R09: 1ffffffff1fee895
R10: dffffc0000000000 R11: fffffbfff1fee896 R12: 0000000000001770
R13: ffff88801e2b7dc0 R14: 0000000000002820 R15: ffffffff8190197e
FS: 00007fc06d494c80(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558b1c2e8c28 CR3: 000000007bd2a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
audit_buffer_alloc kernel/audit.c:1790 [inline]
audit_log_start+0x15e/0xa30 kernel/audit.c:1912
common_lsm_audit+0xdd/0x1b30 security/lsm_audit.c:449
smack_log+0x421/0x540 security/smack/smack_access.c:383
smk_tskacc+0x300/0x370 security/smack/smack_access.c:253
smack_inode_permission+0x2dc/0x380 security/smack/smack_lsm.c:1234
security_inode_permission+0xa5/0x100 security/security.c:2216
may_lookup fs/namei.c:1761 [inline]
link_path_walk+0x891/0xea0 fs/namei.c:2352
path_lookupat+0xa9/0x450 fs/namei.c:2565
filename_lookup+0x256/0x610 fs/namei.c:2595
do_readlinkat+0xf0/0x3a0 fs/stat.c:537
__do_sys_readlink fs/stat.c:574 [inline]
__se_sys_readlink fs/stat.c:571 [inline]
__x64_sys_readlink+0x7f/0x90 fs/stat.c:571
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: 0033:0x7fc06d117d47
Code: 73 01 c3 48 8b 0d e1 90 0d 00 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 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe5f91a6b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000059
RAX: ffffffffffffffda RBX: 0000558b1c2e6140 RCX: 00007fc06d117d47
RDX: 0000000000000400 RSI: 00007ffe5f91aac8 RDI: 00007ffe5f91a6c8
RBP: 00007ffe5f91af08 R08: 0000558aef8307b7 R09: 0000000000000000
R10: 0000000000000010 R11: 0000000000000202 R12: 0000000000000200
R13: 00007ffe5f91aac8 R14: 00007ffe5f91a6c8 R15: 0000558b1c2d4da0