INFO: task syz-executor.2:5758 blocked for more than 143 seconds.
Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:28720 pid:5758 tgid:5754 ppid:5085 flags:0x00000006
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0xf15/0x5d00 kernel/sched/core.c:6746
__schedule_loop kernel/sched/core.c:6823 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6838
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline]
__down_write_common+0x950/0x13f0 kernel/locking/rwsem.c:1306
inode_lock_nested include/linux/fs.h:830 [inline]
do_unlinkat+0x288/0x750 fs/namei.c:4386
__do_sys_unlink fs/namei.c:4447 [inline]
__se_sys_unlink fs/namei.c:4445 [inline]
__x64_sys_unlink+0xc7/0x110 fs/namei.c:4445
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fdf47dea9
RSP: 002b:00007f6fe01760c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f6fdf5ac050 RCX: 00007f6fdf47dea9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00007f6fdf4ca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f6fdf5ac050 R15: 00007ffe4fdb3e08
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#0: ffffffff8d7b0e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
2 locks held by kworker/u8:2/34:
2 locks held by getty/4829:
#0: ffff88802ade60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201
2 locks held by syz-executor.3/5246:
2 locks held by syz-executor.4/5407:
1 lock held by syz-executor.2/5755:
2 locks held by syz-executor.2/5758:
#0: ffff888081568420 (sb_writers#19){.+.+}-{0:0}, at: do_unlinkat+0x1d3/0x750 fs/namei.c:4382
#1: ffff88805881cc18 (&type->i_mutex_dir_key#9/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:830 [inline]
#1: ffff88805881cc18 (&type->i_mutex_dir_key#9/1){+.+.}-{3:3}, at: do_unlinkat+0x288/0x750 fs/namei.c:4386
3 locks held by syz-executor.0/7218:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
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:223 [inline]
watchdog+0xf86/0x1240 kernel/hung_task.c:380
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5755 Comm: syz-executor.2 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x29/0x60 kernel/kcov.c:207
Code: 90 f3 0f 1e fa 65 48 8b 15 24 15 76 7e 65 8b 05 25 15 76 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 14 16 00 00 <85> c0 74 2b 8b 82 f0 15 00 00 83 f8 02 75 20 48 8b 8a f8 15 00 00
RSP: 0018:ffffc900000072e0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc900041ef928 RCX: ffffc900000073ac
RDX: ffff888027d11e00 RSI: ffffffff813d0b09 RDI: ffffc900041ef928
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000004 R12: ffffffff90365b06
R13: ffffc900041ef930 R14: ffffffff90365b0a R15: 0000000000000001
FS: 00007f6fe01976c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff3ae17f5b0 CR3: 000000005e684000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__read_once_word_nocheck+0x9/0x20 include/asm-generic/rwonce.h:67
deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline]
unwind_next_frame+0xdc3/0x23a0 arch/x86/kernel/unwind_orc.c:585
arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:3966 [inline]
__kmalloc+0x1f9/0x440 mm/slub.c:3979
kmalloc include/linux/slab.h:632 [inline]
kzalloc include/linux/slab.h:749 [inline]
neigh_alloc net/core/neighbour.c:494 [inline]
___neigh_create+0x152b/0x2ae0 net/core/neighbour.c:648
ip6_finish_output2+0x112f/0x18b0 net/ipv6/ip6_output.c:128
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
NF_HOOK_COND include/linux/netfilter.h:303 [inline]
ip6_output+0x1eb/0x540 net/ipv6/ip6_output.c:243
dst_output include/net/dst.h:450 [inline]
NF_HOOK include/linux/netfilter.h:314 [inline]
ndisc_send_skb+0xa2d/0x1c30 net/ipv6/ndisc.c:509
ndisc_send_rs+0x12b/0x690 net/ipv6/ndisc.c:719
addrconf_rs_timer+0x422/0x850 net/ipv6/addrconf.c:4038
call_timer_fn+0x1a0/0x610 kernel/time/timer.c:1793
expire_timers kernel/time/timer.c:1844 [inline]
__run_timers+0x74b/0xaf0 kernel/time/timer.c:2418
__run_timer_base kernel/time/timer.c:2429 [inline]
__run_timer_base kernel/time/timer.c:2422 [inline]
run_timer_base+0x111/0x190 kernel/time/timer.c:2438
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2448
__do_softirq+0x218/0x922 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:633 [inline]
irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:check_kcov_mode kernel/kcov.c:175 [inline]
RIP: 0010:write_comp_data+0x2e/0x90 kernel/kcov.c:236
Code: 89 f8 49 89 f1 65 48 8b 15 ff 1b 76 7e 65 8b 05 00 1c 76 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 14 16 00 00 85 c0 74 4f <8b> 82 f0 15 00 00 83 f8 03 75 44 48 8b 82 f8 15 00 00 8b 92 f4 15
RSP: 0018:ffffc900041ee1e8 EFLAGS: 00000246
RAX: 0000000080000001 RBX: 0000000000000007 RCX: ffffffff813d1d91
RDX: ffff888027d11e00 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffffffff8b09cea0 R08: 0000000000000001 R09: 0000000000000008
R10: 0000000000000005 R11: 0000000000000001 R12: 0000000000000005
R13: 0000000000000001 R14: 0000000000000008 R15: ffffc900041ee2d5
__sanitizer_cov_trace_switch+0x54/0x90 kernel/kcov.c:341
unwind_next_frame+0x6c1/0x23a0 arch/x86/kernel/unwind_orc.c:515
arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2106 [inline]
slab_free mm/slub.c:4280 [inline]
kmem_cache_free+0x12e/0x380 mm/slub.c:4344
free_buffer_head+0x4e/0x110 fs/buffer.c:3017
try_to_free_buffers+0x1c5/0x2d0 fs/buffer.c:2958
filemap_release_folio+0x219/0x280 mm/filemap.c:4133
shrink_folio_list+0x295a/0x3f00 mm/vmscan.c:1376
evict_folios+0x6e6/0x1bb0 mm/vmscan.c:4537
try_to_shrink_lruvec+0x618/0x9b0 mm/vmscan.c:4733
lru_gen_shrink_lruvec mm/vmscan.c:4876 [inline]
shrink_lruvec+0x2df/0x29b0 mm/vmscan.c:5653
shrink_node_memcgs mm/vmscan.c:5873 [inline]
shrink_node+0x81e/0x3a80 mm/vmscan.c:5908
shrink_zones mm/vmscan.c:6152 [inline]
do_try_to_free_pages+0x361/0x1a20 mm/vmscan.c:6214
try_to_free_mem_cgroup_pages+0x317/0x7f0 mm/vmscan.c:6529
try_charge_memcg+0x3d1/0x11a0 mm/memcontrol.c:2783
try_charge mm/memcontrol.c:2931 [inline]
charge_memcg mm/memcontrol.c:7284 [inline]
__mem_cgroup_charge+0xa6/0x140 mm/memcontrol.c:7299
mem_cgroup_charge include/linux/memcontrol.h:691 [inline]
__filemap_add_folio+0x83d/0xf00 mm/filemap.c:864
filemap_add_folio+0xaf/0x1e0 mm/filemap.c:947
do_read_cache_folio+0x1dd/0x550 mm/filemap.c:3714
do_read_cache_page mm/filemap.c:3813 [inline]
read_cache_page+0x5b/0x160 mm/filemap.c:3822
read_mapping_page include/linux/pagemap.h:888 [inline]
dir_get_page fs/sysv/dir.c:64 [inline]
sysv_find_entry+0x1e5/0x690 fs/sysv/dir.c:157
sysv_inode_by_name+0x71/0x3b0 fs/sysv/dir.c:374
sysv_lookup fs/sysv/namei.c:38 [inline]
sysv_lookup+0x8c/0x100 fs/sysv/namei.c:31
__lookup_slow+0x24f/0x460 fs/namei.c:1692
lookup_slow fs/namei.c:1709 [inline]
walk_component+0x350/0x5b0 fs/namei.c:2004
lookup_last fs/namei.c:2461 [inline]
path_lookupat+0x17f/0x770 fs/namei.c:2485
filename_lookup+0x1e5/0x5b0 fs/namei.c:2514
user_path_at_empty+0x42/0x60 fs/namei.c:2921
user_path_at include/linux/namei.h:57 [inline]
__do_sys_chdir fs/open.c:558 [inline]
__se_sys_chdir fs/open.c:552 [inline]
__x64_sys_chdir+0xc2/0x270 fs/open.c:552
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fdf47dea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6fe01970c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 00007f6fdf5abf80 RCX: 00007f6fdf47dea9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140
RBP: 00007f6fdf4ca4a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f6fdf5abf80 R15: 00007ffe4fdb3e08