syzbot

INFO: task syz.5.178:7715 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.178       state:D stack:20224 pid:7715  tgid:7714  ppid:6032   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x17fb/0x4be0 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578
 inode_lock include/linux/fs.h:818 [inline]
 do_truncate fs/open.c:63 [inline]
 do_ftruncate+0x44e/0x580 fs/open.c:181
 do_sys_ftruncate fs/open.c:196 [inline]
 __do_sys_ftruncate fs/open.c:201 [inline]
 __se_sys_ftruncate fs/open.c:199 [inline]
 __x64_sys_ftruncate+0x94/0xf0 fs/open.c:199
 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: 0033:0x7fba71f85d29
RSP: 002b:00007fba72e8d038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007fba72175fa0 RCX: 00007fba71f85d29
RDX: 0000000000000000 RSI: 0000000002007ffc RDI: 0000000000000004
RBP: 00007fba72001b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fba72175fa0 R15: 00007fff5472d458
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
3 locks held by kworker/0:1/9:
 #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317
 #1: ffffc900000e7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc900000e7d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317
 #2: ffff888074820240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1490
1 lock held by khungtaskd/30:
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
3 locks held by kworker/0:2/974:
3 locks held by kworker/u8:5/1014:
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317
 #1: ffffc90003d2fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc90003d2fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317
 #2: ffffffff8fca0d08 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:285
2 locks held by kworker/u8:8/3439:
3 locks held by kworker/u8:12/3574:
 #0: ffff888030993948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
 #0: ffff888030993948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3317
 #1: ffffc9000cb57d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
 #1: ffffc9000cb57d00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3317
 #2: ffffffff8fca0d08 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4215
1 lock held by syslogd/5180:
2 locks held by getty/5577:
 #0: ffff8880314a60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz.5.178/7715:
 #0: ffff88805cf1c420 (sb_writers#23){.+.+}-{0:0}, at: do_ftruncate+0x28b/0x580 fs/open.c:178
 #1: ffff888059624c48 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
 #1: ffff888059624c48 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: do_truncate fs/open.c:63 [inline]
 #1: ffff888059624c48 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: do_ftruncate+0x44e/0x580 fs/open.c:181
5 locks held by syz.5.178/7736:
 #0: ffff88805cf1c420 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:516
 #1: ffff888059624c48 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline]
 #1: ffff888059624c48 (&sb->s_type->i_mutex_key#30){++++}-{4:4}, at: do_truncate+0x20c/0x310 fs/open.c:63
 #2: ffff888052e00a38 (&c->snapshot_create_lock){.+.+}-{4:4}, at: bch2_truncate+0x166/0x2d0 fs/bcachefs/io_misc.c:292
 #3: ffff888052e04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:158 [inline]
 #3: ffff888052e04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:249 [inline]
 #3: ffff888052e04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7e1/0xd30 fs/bcachefs/btree_iter.c:3228
 #4: ffff888052e266d0 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197
5 locks held by syz-executor/10383:
 #0: ffff88807e618420 (sb_writers#10){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline]
 #0: ffff88807e618420 (sb_writers#10){.+.+}-{0:0}, at: vfs_write+0x225/0xd30 fs/read_write.c:675
 #1: ffff88807f3f8c88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325
 #2: ffffffff8e96e828 (cgroup_mutex){+.+.}-{4:4}, at: cgroup_lock include/linux/cgroup.h:368 [inline]
 #2: ffffffff8e96e828 (cgroup_mutex){+.+.}-{4:4}, at: cgroup_kn_lock_live+0xe6/0x290 kernel/cgroup/cgroup.c:1662
 #3: ffffffff8e7d2ed0 (cpu_hotplug_lock){++++}-{0:0}, at: cgroup_attach_lock kernel/cgroup/cgroup.c:2435 [inline]
 #3: ffffffff8e7d2ed0 (cpu_hotplug_lock){++++}-{0:0}, at: cgroup_procs_write_start+0x1a0/0x660 kernel/cgroup/cgroup.c:2939
 #4: ffffffff8e96ea10 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: cgroup_attach_lock kernel/cgroup/cgroup.c:2437 [inline]
 #4: ffffffff8e96ea10 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: cgroup_procs_write_start+0x1b5/0x660 kernel/cgroup/cgroup.c:2939
2 locks held by syz-executor/10696:
 #0: ffffffff8fca0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8fca0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline]
 #0: ffffffff8fca0d08 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xce2/0x2210 net/core/rtnetlink.c:4011
 #1: ffff88801cb3d4e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x22d/0x420 drivers/net/wireguard/device.c:50
1 lock held by syz.2.433/11746:
 #0: ffff8880299cc0e0 (&type->s_umount_key#57/1){+.+.}-{4:4}, at: alloc_super+0x221/0x9d0 fs/super.c:344
1 lock held by rm/11837:
 #0: ffff8880b863e758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __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:234 [inline]
 watchdog+0xff6/0x1040 kernel/hung_task.c:397
 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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3574 Comm: kworker/u8:12 Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:cfg80211_wiphy_work+0x5/0x480 net/wireless/core.c:418
Code: 94 f6 48 81 c3 e8 01 00 00 48 89 df 5b e9 b3 81 ef fa 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <41> 57 41 56 41 55 41 54 53 48 83 ec 18 49 89 ff e8 66 24 94 f6 4d
RSP: 0018:ffffc9000cb57bb0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88802ffa5b18 RCX: 1ffff11005ff4b63
RDX: 0000000000000000 RSI: ffffffff8c5edf00 RDI: ffff88804a418660
RBP: ffffc9000cb57dc0 R08: ffffffff8168f045 R09: 1ffffffff2030b4e
R10: dffffc0000000000 R11: ffffffff8b0b4da0 R12: ffff88804a418660
R13: ffffffff8168efb6 R14: 0000000000000001 R15: 0000000002000000
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f868c747000 CR3: 0000000033b3c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 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
 </TASK>