INFO: task bch-reclaim/loo:13449 blocked for more than 143 seconds.
      Not tainted 6.17.0-rc1-syzkaller-00211-g90d970cade8e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-reclaim/loo state:D stack:26696 pid:13449 tgid:13449 ppid:2      task_flags:0x200040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x7e6/0x1360 kernel/locking/mutex.c:760
 bch2_journal_reclaim_thread+0x16b/0x4f0 fs/bcachefs/journal_reclaim.c:773
 kthread+0x711/0x8a0 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: 31 Comm: khungtaskd Not tainted 6.17.0-rc1-syzkaller-00211-g90d970cade8e #0 PREEMPT(full) 
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+0x711/0x8a0 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: 18095 Comm: syz.2.3048 Not tainted 6.17.0-rc1-syzkaller-00211-g90d970cade8e #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:873 [inline]
RIP: 0010:percpu_ref_get_many+0xf9/0x140 include/linux/percpu-refcount.h:209
Code: 61 0d 01 48 c7 c7 80 4b 98 8b be 66 03 00 00 48 c7 c2 20 4c 98 8b e8 b6 be 71 ff 48 c7 c7 e0 9e 13 8e 48 89 de e8 97 a4 71 ff <5b> 41 5c 41 5e 41 5f e9 1b 50 7b ff 49 83 c7 08 4c 89 f8 48 c1 e8
RSP: 0018:ffffc9000b2b7090 EFLAGS: 00000282
RAX: 6ff40dc2508ff800 RBX: ffffffff822bc679 RCX: 6ff40dc2508ff800
RDX: 0000000000000000 RSI: ffffffff8be334e0 RDI: ffffffff8be334a0
RBP: ffffea000239c388 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff94000473871 R12: dffffc0000000000
R13: ffffc9000b2b7160 R14: 0000000000000001 R15: ffff888140469a10
FS:  00007f501e0816c0(0000) GS:ffff888125c1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdcb3ff6d58 CR3: 0000000044e5e000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
 css_get include/linux/cgroup_refcnt.h:11 [inline]
 uncharge_folio+0x23d/0x6b0 mm/memcontrol.c:4860
 __mem_cgroup_uncharge_folios+0xf0/0x1c0 mm/memcontrol.c:4904
 mem_cgroup_uncharge_folios include/linux/memcontrol.h:682 [inline]
 folios_put_refs+0x551/0x640 mm/swap.c:996
 folio_batch_release include/linux/pagevec.h:101 [inline]
 mapping_try_invalidate+0x324/0x410 mm/truncate.c:554
 ext4_dio_write_iter fs/ext4/file.c:629 [inline]
 ext4_file_write_iter+0x199a/0x1bc0 fs/ext4/file.c:721
 iter_file_splice_write+0x9c9/0x10b0 fs/splice.c:738
 do_splice_from fs/splice.c:935 [inline]
 direct_splice_actor+0x101/0x160 fs/splice.c:1158
 splice_direct_to_actor+0x5a8/0xcc0 fs/splice.c:1102
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0x181/0x270 fs/splice.c:1227
 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f501d18ebe9
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:00007f501e081038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f501d3b5fa0 RCX: 00007f501d18ebe9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006
RBP: 00007f501d211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000003ffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f501d3b6038 R14: 00007f501d3b5fa0 R15: 00007ffddfa2dc28
 </TASK>