INFO: task syz.0.70:5508 blocked for more than 143 seconds.
Not tainted 6.12.0-rc3-next-20241015-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.70 state:D stack:25016 pid:5508 tgid:5507 ppid:5239 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5328 [inline]
__schedule+0x18af/0x4bd0 kernel/sched/core.c:6690
__schedule_loop kernel/sched/core.c:6767 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6782
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6839
__mutex_lock_common kernel/locking/mutex.c:684 [inline]
__mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
fdget_pos+0x254/0x320 fs/file.c:1234
ksys_lseek fs/read_write.c:389 [inline]
__do_sys_lseek fs/read_write.c:406 [inline]
__se_sys_lseek fs/read_write.c:404 [inline]
__x64_sys_lseek+0x7a/0x1e0 fs/read_write.c:404
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: 0033:0x7fba0357dff9
RSP: 002b:00007fba04315038 EFLAGS: 00000246 ORIG_RAX: 0000000000000008
RAX: ffffffffffffffda RBX: 00007fba03735f80 RCX: 00007fba0357dff9
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fba035f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fba03735f80 R15: 00007ffde8a92148
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#0: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
1 lock held by khungtaskd/30:
#0: ffffffff8e939e20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e939e20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e939e20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
3 locks held by kworker/u8:4/62:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc900015d7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc900015d7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fcdc488 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
2 locks held by getty/4998:
#0: ffff88802e2260a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz.0.70/5508:
#0: ffff888011a33278 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x254/0x320 fs/file.c:1234
2 locks held by syz.0.70/5518:
5 locks held by kworker/u8:9/6458:
#0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc9000ceafd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000ceafd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fccf910 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:587
#3: ffffffff8fcdc488 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xaa0 net/core/dev.c:11942
#4: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#4: ffffffff8e93f3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
1 lock held by syz-executor/8118:
#0: ffffffff8fcdc488 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fcdc488 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6746
2 locks held by syz.2.973/8241:
#0: ffffffff8fd42870 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8fcdc488 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16578
2 locks held by syz.1.976/8244:
2 locks held by syz.3.975/8250:
#0: ffffffff8fd42870 (cb_lock){++++}-{3:3}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
#1: ffffffff8fcdc488 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x5f/0x8b0 net/wireless/nl80211.c:16578
2 locks held by syz.0.978/8252:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-next-20241015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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: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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5518 Comm: syz.0.70 Not tainted 6.12.0-rc3-next-20241015-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:unwind_next_frame+0x12d/0x22d0
Code: 6d 35 48 89 e8 48 c1 e8 03 48 89 44 24 28 42 0f b6 04 20 84 c0 0f 85 b8 19 00 00 4c 0f be 7d 00 48 8b 44 24 30 42 80 3c 20 00 <48> 8b 5c 24 18 74 08 48 89 df e8 b4 4d bd 00 4c 03 3b 49 ff cf 4c
RSP: 0018:ffffc90009545d70 EFLAGS: 00000246
RAX: 1ffff920012a8bd1 RBX: 0000000000000000 RCX: ffffffff8bd5d500
RDX: dffffc0000000000 RSI: ffffffff81cc9943 RDI: ffffffff814166e0
RBP: ffffc90009545e75 R08: 0000000000000010 R09: ffffc90009545f30
R10: ffffc90009545e90 R11: ffffffff81809390 R12: dffffc0000000000
R13: ffffc90009545e40 R14: ffffffff81cc9943 R15: 0000000000000000
FS: 00007fba042f46c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c86bff000 CR3: 0000000030a3a000 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
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2329 [inline]
slab_free mm/slub.c:4588 [inline]
kmem_cache_free+0x1a2/0x440 mm/slub.c:4690
free_buffer_head+0x54/0x240 fs/buffer.c:3037
try_to_free_buffers+0x311/0x5f0 fs/buffer.c:2978
shrink_folio_list+0x240c/0x8cc0 mm/vmscan.c:1432
evict_folios+0x549b/0x7b50 mm/vmscan.c:4596
try_to_shrink_lruvec+0x9ab/0xbb0 mm/vmscan.c:4791
lru_gen_shrink_lruvec mm/vmscan.c:4933 [inline]
shrink_lruvec+0x541/0x31b0 mm/vmscan.c:5688
shrink_node_memcgs mm/vmscan.c:5924 [inline]
shrink_node+0xb09/0x3df0 mm/vmscan.c:5964
shrink_zones mm/vmscan.c:6209 [inline]
do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6271
try_to_free_mem_cgroup_pages+0x48c/0xad0 mm/vmscan.c:6603
try_charge_memcg+0x8c2/0x1170 mm/memcontrol.c:2218
try_charge mm/memcontrol-v1.h:19 [inline]
charge_memcg+0xa6/0x1e0 mm/memcontrol.c:4477
__mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:4492
mem_cgroup_charge include/linux/memcontrol.h:694 [inline]
filemap_add_folio+0xb3/0x650 mm/filemap.c:967
do_read_cache_folio+0x341/0x850 mm/filemap.c:3794
read_mapping_folio include/linux/pagemap.h:1011 [inline]
dir_get_folio fs/sysv/dir.c:64 [inline]
sysv_readdir+0x193/0x540 fs/sysv/dir.c:93
iterate_dir+0x571/0x800 fs/readdir.c:108
__do_sys_getdents64 fs/readdir.c:407 [inline]
__se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392
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: 0033:0x7fba0357dff9
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:00007fba042f4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fba03736058 RCX: 00007fba0357dff9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fba035f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fba03736058 R15: 00007ffde8a92148