INFO: task syz-executor:8204 blocked for more than 143 seconds.
      Tainted: G        W           syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:17048 pid:8204  tgid:8204  ppid:1      task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 __closure_sync_timeout+0x282/0x3a0 lib/closure.c:217
 closure_sync_timeout include/linux/closure.h:206 [inline]
 __bch2_wait_on_allocator+0x112/0x240 fs/bcachefs/alloc_foreground.c:1677
 bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:315 [inline]
 bch2_btree_update_start+0x18dc/0x1de0 fs/bcachefs/btree_update_interior.c:1293
 bch2_btree_split_leaf+0x14b/0x8e0 fs/bcachefs/btree_update_interior.c:1921
 bch2_trans_commit_error+0x1b7/0x1130 fs/bcachefs/btree_trans_commit.c:914
 __bch2_trans_commit+0x1bb5/0x8870 fs/bcachefs/btree_trans_commit.c:1104
 bch2_trans_commit fs/bcachefs/btree_update.h:241 [inline]
 bch2_btree_write_buffer_flush_locked+0x451f/0x4dd0 fs/bcachefs/btree_write_buffer.c:454
 btree_write_buffer_flush_seq+0x18c7/0x1a40 fs/bcachefs/btree_write_buffer.c:572
 bch2_btree_write_buffer_journal_flush+0x69/0xb0 fs/bcachefs/btree_write_buffer.c:588
 journal_flush_pins+0x8e3/0xe90 fs/bcachefs/journal_reclaim.c:604
 journal_flush_pins_or_still_flushing fs/bcachefs/journal_reclaim.c:871 [inline]
 journal_flush_done+0x112/0x810 fs/bcachefs/journal_reclaim.c:889
 bch2_journal_flush_pins+0x1b5/0x250 fs/bcachefs/journal_reclaim.c:921
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 __bch2_fs_read_only+0x144/0x5b0 fs/bcachefs/super.c:291
 bch2_fs_read_only+0x42a/0xb00 fs/bcachefs/super.c:366
 __bch2_fs_stop+0x100/0x900 fs/bcachefs/super.c:677
 generic_shutdown_super+0x135/0x2c0 fs/super.c:643
 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618
 deactivate_locked_super+0xb9/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe8e67ff17
RSP: 002b:00007fff43fdc418 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007efe8e701c05 RCX: 00007efe8e67ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff43fdc4d0
RBP: 00007fff43fdc4d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff43fdd560
R13: 00007efe8e701c05 R14: 0000000000042b81 R15: 00007fff43fdd5a0
 </TASK>
INFO: task bch-reclaim/loo:9177 blocked for more than 143 seconds.
      Tainted: G        W           syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-reclaim/loo state:D stack:18576 pid:9177  tgid:9177  ppid:2      task_flags:0x200040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x16f3/0x4c20 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 rt_mutex_schedule+0x77/0xf0 kernel/sched/core.c:7339
 rt_mutex_slowlock_block+0x5ba/0x6d0 kernel/locking/rtmutex.c:1647
 __rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
 __rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
 rt_mutex_slowlock+0x2b1/0x6e0 kernel/locking/rtmutex.c:1800
 __rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
 __mutex_lock_common kernel/locking/rtmutex_api.c:536 [inline]
 mutex_lock_nested+0x16a/0x1d0 kernel/locking/rtmutex_api.c:547
 bch2_journal_reclaim_thread+0x16b/0x4f0 fs/bcachefs/journal_reclaim.c:773
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf93/0xfe0 kernel/hung_task.c:491
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 43 Comm: kworker/u8:2 Tainted: G        W           syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: writeback wb_workfn (flush-bcachefs-112)
RIP: 0010:memcg_rstat_updated+0x70/0x220 mm/memcontrol.c:-1
Code: de fc ff 4d 8b 2e 4d 85 ed 0f 84 b6 01 00 00 89 d8 f7 d8 0f 48 c3 89 44 24 04 48 c7 c0 58 3e 1d 8f 48 c1 e8 03 48 89 44 24 08 <eb> 0c 4c 8b 2b 4d 85 ed 0f 84 8d 01 00 00 e8 dd 89 d5 08 89 c3 83
RSP: 0018:ffffc90000b46f40 EFLAGS: 00000802
RAX: 1ffffffff1e3a7cb RBX: 00000000ffffffff RCX: ffff8880202abb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1e3a7c7 R12: 00000000ffffffff
R13: 0000607ed93beb80 R14: ffff88801aaf21a0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881268c5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1c17cde9c CR3: 000000005577e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 mod_memcg_lruvec_state+0x165/0x370 mm/memcontrol.c:751
 __mod_lruvec_state mm/memcontrol.c:775 [inline]
 __lruvec_stat_mod_folio+0x1a0/0x2f0 mm/memcontrol.c:795
 lruvec_stat_mod_folio include/linux/vmstat.h:545 [inline]
 folio_clear_dirty_for_io+0x4b6/0x8b0 mm/page-writeback.c:2975
 folio_prepare_writeback mm/page-writeback.c:2431 [inline]
 writeback_get_folio mm/page-writeback.c:2469 [inline]
 writeback_iter+0xaba/0x12a0 mm/page-writeback.c:2562
 write_cache_pages+0xad/0x100 mm/page-writeback.c:2611
 bch2_writepages+0xf9/0x2d0 fs/bcachefs/fs-io-buffered.c:666
 do_writepages+0x32e/0x550 mm/page-writeback.c:2634
 __writeback_single_inode+0x145/0x1000 fs/fs-writeback.c:1680
 writeback_sb_inodes+0x6b7/0xf60 fs/fs-writeback.c:1976
 wb_writeback+0x43b/0xaf0 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x40e/0xf00 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>