INFO: task syz.2.122:6437 blocked for more than 143 seconds.
Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.122 state:D stack:26800 pid:6437 tgid:6376 ppid:5757 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0x1843/0x4ae0 kernel/sched/core.c:6674
__schedule_loop kernel/sched/core.c:6751 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6766
io_schedule+0x8d/0x110 kernel/sched/core.c:7551
folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309
folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189
__filemap_fdatawait_range+0x17c/0x2b0 mm/filemap.c:533
filemap_write_and_wait_range+0x1e3/0x280 mm/filemap.c:694
bch2_write_invalidate_inode_pages_range+0x82/0x120 fs/bcachefs/fs-io-pagecache.c:61
bchfs_fcollapse_finsert+0x207/0x640 fs/bcachefs/fs-io.c:577
bch2_fallocate_dispatch+0x3c9/0x540
vfs_fallocate+0x569/0x6e0 fs/open.c:333
ksys_fallocate fs/open.c:356 [inline]
__do_sys_fallocate fs/open.c:364 [inline]
__se_sys_fallocate fs/open.c:362 [inline]
__x64_sys_fallocate+0xbd/0x110 fs/open.c:362
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: 0033:0x7f3f8f97def9
RSP: 002b:00007f3f907bf038 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007f3f8fb36208 RCX: 00007f3f8f97def9
RDX: 0000000000000000 RSI: 0000000000000020 RDI: 0000000000000006
RBP: 00007f3f8f9f0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000010000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f3f8fb36208 R15: 00007ffe78102928
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8e7e2308 (wq_pool_mutex){+.+.}-{3:3}, at: pwq_release_workfn+0x422/0x800 kernel/workqueue.c:5064
2 locks held by kworker/u8:0/11:
1 lock held by khungtaskd/30:
#0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701
3 locks held by kworker/u8:2/35:
#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: ffffc90000ab7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90000ab7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fcb97c8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
2 locks held by getty/4979:
#0: ffff88802ec620a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
1 lock held by syz.2.122/6430:
#0: ffff888031268420 (sb_writers#35){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline]
#0: ffff888031268420 (sb_writers#35){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1062
1 lock held by syz.2.122/6431:
#0: ffff888031268420 (sb_writers#35){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline]
#0: ffff888031268420 (sb_writers#35){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
2 locks held by syz.2.122/6437:
#0: ffff888031268420 (sb_writers#35){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline]
#0: ffff888031268420 (sb_writers#35){.+.+}-{0:0}, at: vfs_fallocate+0x4fe/0x6e0 fs/open.c:332
#1: ffff88804bbc1008 (&sb->s_type->i_mutex_key#39){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline]
#1: ffff88804bbc1008 (&sb->s_type->i_mutex_key#39){+.+.}-{3:3}, at: bch2_fallocate_dispatch+0x1e2/0x540 fs/bcachefs/fs-io.c:781
3 locks held by bch-reclaim/loo/6417:
2 locks held by syz.1.184/6879:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline]
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802
2 locks held by syz.0.216/7114:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline]
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802
2 locks held by syz.0.216/7137:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline]
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802
3 locks held by syz.2.226/7196:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888057e042c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline]
#1: ffff888057e042c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline]
#1: ffff888057e042c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3200
#2: ffff888057e26690 (&c->gc_lock){.+.+}-{3:3}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197
2 locks held by syz.2.231/7468:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline]
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802
2 locks held by syz.1.279/7587:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline]
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802
2 locks held by syz.3.301/7702:
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880312680e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline]
#1: ffff888031268938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802
8 locks held by syz-executor/7765:
#0: ffff888031d3c420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline]
#0: ffff888031d3c420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
#1: ffff888043267888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325
#2: ffff888143fc1d28 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326
#3: ffffffff8f5571e8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
#4: ffff8880526a90e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
#4: ffff8880526a90e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
#4: ffff8880526a90e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292
#5: ffff8880526ab250 (&devlink->lock_key#12){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672
#6: ffffffff8fcb97c8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773
#7: ffffffff8e93d478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#7: ffffffff8e93d478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
1 lock held by syz.4.323/7792:
#0: ffffffff8e93d478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#0: ffffffff8e93d478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
5 locks held by syz.2.327/7807:
2 locks held by syz.1.326/7824:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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: 7765 Comm: syz-executor Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__bfs+0x3d6/0x6f0 kernel/locking/lockdep.c:1811
Code: 00 74 12 4c 89 ff e8 29 c5 8a 00 48 ba 00 00 00 00 00 fc ff df 4d 8b 27 4d 39 fc 0f 84 1d fd ff ff 41 b5 01 eb 0d 4d 8b 24 24 <4d> 39 fc 0f 84 0b fd ff ff 49 8d 5c 24 30 48 89 d8 48 c1 e8 03 80
RSP: 0018:ffffc90003ab6be0 EFLAGS: 00000046
RAX: 1ffffffff2d6ff46 RBX: ffffffff96b7fa60 RCX: 000000000000001a
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff942257e0
RBP: ffffc90003ab6cc0 R08: ffffffff942257e7 R09: 1ffffffff2844afc
R10: dffffc0000000000 R11: fffffbfff2844afd R12: ffffffff96b7faa0
R13: 0000000000000000 R14: ffffffff96b07b50 R15: ffffffff93c02ea0
FS: 0000555563c01500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b95014c190 CR3: 0000000072560000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__bfs_forwards kernel/locking/lockdep.c:1844 [inline]
check_path+0x21/0x40 kernel/locking/lockdep.c:2159
check_noncircular+0x259/0x4a0 kernel/locking/lockdep.c:2188
check_prev_add kernel/locking/lockdep.c:3158 [inline]
check_prevs_add kernel/locking/lockdep.c:3277 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5199
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822
down_write+0x99/0x220 kernel/locking/rwsem.c:1579
kernfs_remove+0x72/0xa0 fs/kernfs/dir.c:1527
__kobject_del+0xe2/0x310 lib/kobject.c:604
kobject_del+0x45/0x60 lib/kobject.c:627
cleanup_glue_dir+0x19d/0x210 drivers/base/core.c:3407
device_del+0x80a/0x9b0 drivers/base/core.c:3892
unregister_netdevice_many_notify+0x1851/0x1da0 net/core/dev.c:11433
unregister_netdevice_many net/core/dev.c:11461 [inline]
unregister_netdevice_queue+0x303/0x370 net/core/dev.c:11335
unregister_netdevice include/linux/netdevice.h:3118 [inline]
nsim_destroy+0x180/0x5c0 drivers/net/netdevsim/netdev.c:778
__nsim_dev_port_del+0x14b/0x1b0 drivers/net/netdevsim/dev.c:1425
nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline]
nsim_dev_reload_destroy+0x28a/0x490 drivers/net/netdevsim/dev.c:1658
nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1673
device_remove drivers/base/dd.c:566 [inline]
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x4a9/0x7c0 drivers/base/dd.c:1295
bus_remove_device+0x34f/0x420 drivers/base/bus.c:574
device_del+0x57a/0x9b0 drivers/base/core.c:3871
device_unregister+0x20/0xc0 drivers/base/core.c:3912
nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline]
del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:226
kernfs_fop_write_iter+0x3a0/0x500 fs/kernfs/file.c:334
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_write+0x1a0/0x2c0 fs/read_write.c:736
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: 0033:0x7f41ac77c9df
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 1c 8e 02 00 48
RSP: 002b:00007ffc2716d400 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f41ac77c9df
RDX: 0000000000000001 RSI: 00007ffc2716d450 RDI: 0000000000000005
RBP: 00007f41ac7f1c15 R08: 0000000000000000 R09: 00007ffc2716d257
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffc2716d450 R14: 00007f41ad464620 R15: 0000000000000003