INFO: task kworker/u8:8:2923 blocked for more than 143 seconds.
Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:8 state:D stack:20880 pid:2923 tgid:2923 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-bcachefs-11)
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0x1843/0x4ae0 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6767
io_schedule+0x8d/0x110 kernel/sched/core.c:7552
folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309
folio_lock include/linux/pagemap.h:1148 [inline]
writeback_get_folio mm/page-writeback.c:2496 [inline]
writeback_iter+0x992/0x18d0 mm/page-writeback.c:2590
write_cache_pages+0xb1/0x230 mm/page-writeback.c:2639
bch2_writepages+0x14f/0x380 fs/bcachefs/fs-io-buffered.c:639
do_writepages+0x35d/0x870 mm/page-writeback.c:2683
__writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658
writeback_sb_inodes+0x80c/0x1370 fs/fs-writeback.c:1954
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2025
wb_writeback+0x42f/0xbd0 fs/fs-writeback.c:2136
wb_check_background_flush fs/fs-writeback.c:2206 [inline]
wb_do_writeback fs/fs-writeback.c:2294 [inline]
wb_workfn+0xc58/0x1090 fs/fs-writeback.c:2321
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
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
INFO: task syz-executor:5362 blocked for more than 144 seconds.
Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20696 pid:5362 tgid:5362 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0x1843/0x4ae0 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6767
schedule_timeout+0xb0/0x310 kernel/time/timer.c:2591
do_wait_for_common kernel/sched/completion.c:95 [inline]
__wait_for_common kernel/sched/completion.c:116 [inline]
wait_for_common kernel/sched/completion.c:127 [inline]
wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
kthread_stop+0x19e/0x640 kernel/kthread.c:710
bch2_copygc_stop+0x4f/0x150 fs/bcachefs/movinggc.c:405
__bch2_fs_read_only+0x47/0x430 fs/bcachefs/super.c:264
bch2_fs_read_only+0xb57/0x1200 fs/bcachefs/super.c:354
__bch2_fs_stop+0x105/0x540 fs/bcachefs/super.c:619
generic_shutdown_super+0x139/0x2d0 fs/super.c:642
bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2179
deactivate_locked_super+0xc4/0x130 fs/super.c:473
cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
task_work_run+0x24f/0x310 kernel/task_work.c:228
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc65af7f327
RSP: 002b:00007ffff5bc16f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fc65af7f327
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffff5bc17b0
RBP: 00007ffff5bc17b0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffff5bc2830
R13: 00007fc65aff0134 R14: 0000000000016223 R15: 00007ffff5bc2870
INFO: task syz.3.89:6063 blocked for more than 145 seconds.
Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.89 state:D stack:25816 pid:6063 tgid:6045 ppid:5233 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0x1843/0x4ae0 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6767
io_schedule+0x8d/0x110 kernel/sched/core.c:7552
folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309
folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189
folio_prepare_writeback mm/page-writeback.c:2455 [inline]
writeback_get_folio mm/page-writeback.c:2497 [inline]
writeback_iter+0xb18/0x18d0 mm/page-writeback.c:2590
write_cache_pages+0xb1/0x230 mm/page-writeback.c:2639
bch2_writepages+0x14f/0x380 fs/bcachefs/fs-io-buffered.c:639
do_writepages+0x35d/0x870 mm/page-writeback.c:2683
filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:398
__filemap_fdatawrite_range mm/filemap.c:431 [inline]
file_write_and_wait_range+0x195/0x280 mm/filemap.c:788
bch2_fsync+0x13a/0x360 fs/bcachefs/fs-io.c:199
generic_write_sync include/linux/fs.h:2871 [inline]
bch2_write_iter+0x21d9/0x23f0 fs/bcachefs/fs-io-buffered.c:1055
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xa6d/0xc90 fs/read_write.c:683
ksys_pwrite64 fs/read_write.c:798 [inline]
__do_sys_pwrite64 fs/read_write.c:808 [inline]
__se_sys_pwrite64 fs/read_write.c:805 [inline]
__x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:805
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: 0033:0x7fe1b0f7dff9
RSP: 002b:00007fe1b1cf3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fe1b1136130 RCX: 00007fe1b0f7dff9
RDX: 000000000000fdef RSI: 0000000020000140 RDI: 0000000000000007
RBP: 00007fe1b0ff0296 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe1b1136130 R15: 00007ffd70840f68
Showing all locks held in the system:
3 locks held by kworker/u8:0/11:
#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: ffffc90000107d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90000107d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fcbef48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
1 lock held by khungtaskd/30:
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701
5 locks held by kworker/u8:2/35:
#0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc90000ab7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90000ab7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fcb2450 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580
#3: ffffffff8fcbef48 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xaa0 net/core/dev.c:11930
#4: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#4: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
3 locks held by kworker/u8:8/2923:
#0: ffff8881416e2948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff8881416e2948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc90009f47d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90009f47d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffff88805c90a0e0 (&type->s_umount_key#69){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562
1 lock held by dhcpcd/4889:
#0: ffffffff8fcbef48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#0: ffffffff8fcbef48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643
2 locks held by getty/4978:
#0: ffff88814c1130a0 (&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
2 locks held by syz-executor/5362:
#0: ffff888029ce40e0 (&type->s_umount_key#69){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff888029ce40e0 (&type->s_umount_key#69){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff888029ce40e0 (&type->s_umount_key#69){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
#1: ffff88805ba80278 (&c->state_lock){+.+.}-{3:3}, at: __bch2_fs_stop+0xfd/0x540 fs/bcachefs/super.c:618
1 lock held by syz.3.89/6046:
#0: ffff88805c90a420 (sb_writers#21){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#0: ffff88805c90a420 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
1 lock held by syz.3.89/6063:
#0: ffff88805c90a420 (sb_writers#21){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#0: ffff88805c90a420 (sb_writers#21){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
2 locks held by bch-copygc/loop/6060:
7 locks held by syz-executor/7374:
#0: ffff888032f16420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#0: ffff888032f16420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
#1: ffff88802d653888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325
#2: ffff888027d0b0f8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326
#3: ffffffff8f55cfc8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x1b4/0x890 drivers/net/netdevsim/bus.c:166
#4: ffff888063bd10e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
#4: ffff888063bd10e8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8e/0x520 drivers/base/dd.c:1005
#5: ffff888063ac6250 (&devlink->lock_key#16){+.+.}-{3:3}, at: nsim_drv_probe+0xcb/0xb80 drivers/net/netdevsim/dev.c:1534
#6: ffffffff8fcbef48 (rtnl_mutex){+.+.}-{3:3}, at: nsim_init_netdevsim drivers/net/netdevsim/netdev.c:678 [inline]
#6: ffffffff8fcbef48 (rtnl_mutex){+.+.}-{3:3}, at: nsim_create+0x408/0x890 drivers/net/netdevsim/netdev.c:750
4 locks held by syz-executor/7375:
#0: ffff888032f16420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline]
#0: ffff888032f16420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679
#1: ffff88804a132888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325
#2: ffff888027d0b1e8 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326
#3: ffffffff8f55cfc8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6060 Comm: bch-copygc/loop Not tainted 6.11.0-syzkaller-11728-gad46e8f95e93 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x11/0x70 kernel/kcov.c:217
Code: 5b e9 d3 a6 5a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 80 d7 03 00 <65> 8b 15 60 24 6f 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc90004216778 EFLAGS: 00000293
RAX: ffffffff840d468b RBX: 000000000000003f RCX: ffff88804ada8000
RDX: ffff88804ada8000 RSI: 0000000000000000 RDI: 0000000000000040
RBP: 0000000000000000 R08: ffffffff840d467c R09: 0000000000000000
R10: ffffc90004216820 R11: fffff52000842d06 R12: 0000000000000000
R13: 0000000000000000 R14: ffff000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5303ff000 CR3: 000000000e734000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
get_inc_field fs/bcachefs/bkey.c:173 [inline]
__bkey_unpack_pos+0x21b/0x790 fs/bcachefs/bkey.c:301
bkey_unpack_pos_format_checked fs/bcachefs/bkey.h:456 [inline]
__bch2_bkey_cmp_left_packed_format_checked fs/bcachefs/bkey.c:1029 [inline]
__bch2_bkey_cmp_left_packed+0xed/0x790 fs/bcachefs/bkey.c:1049
bkey_cmp_left_packed fs/bcachefs/bkey.h:88 [inline]
bch2_bkey_pack_pos_lossy+0xa08/0x1990 fs/bcachefs/bkey.c:532
bch2_btree_node_iter_init+0x894/0x4280 fs/bcachefs/bset.c:1313
__btree_path_level_init fs/bcachefs/btree_iter.c:615 [inline]
bch2_btree_path_level_init+0x4d2/0x9f0 fs/bcachefs/btree_iter.c:635
btree_path_lock_root fs/bcachefs/btree_iter.c:769 [inline]
bch2_btree_path_traverse_one+0x10de/0x2940 fs/bcachefs/btree_iter.c:1170
bch2_btree_path_traverse fs/bcachefs/btree_iter.h:247 [inline]
__bch2_btree_iter_peek fs/bcachefs/btree_iter.c:2197 [inline]
bch2_btree_iter_peek_upto+0xb58/0x6f00 fs/bcachefs/btree_iter.c:2297
bch2_btree_iter_peek_upto_type fs/bcachefs/btree_iter.h:685 [inline]
bch2_copygc_get_buckets fs/bcachefs/movinggc.c:164 [inline]
bch2_copygc+0x8e2/0x4650 fs/bcachefs/movinggc.c:215
bch2_copygc_thread+0x737/0xc20 fs/bcachefs/movinggc.c:375
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