INFO: task bch-reclaim/loo:8564 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:bch-reclaim/loo state:D stack:22320 pid:8564  tgid:8564  ppid:2      task_flags:0x200040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7e6/0x1350
 bch2_journal_reclaim_thread+0x16b/0x4f0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.4.519:9032 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.519       state:D stack:25480 pid:9032  tgid:9030  ppid:6972   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 __iterate_supers+0x126/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc00a18eba9
RSP: 002b:00007fc00af94038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc00a3d6090 RCX: 00007fc00a18eba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc00a3d6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc00a3d6128 R14: 00007fc00a3d6090 R15: 00007fff3442d6e8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:1/51:
 #0: ffff888104a85548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000079fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888109874198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
5 locks held by kworker/1:2/5261:
 #0: ffff888104a85548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90008d57bc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff88802355c198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88811c172198 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
 #4: ffff88811c173160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x400
2 locks held by getty/5684:
 #0: ffff88810ec4d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029032f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
6 locks held by syz-executor/5852:
 #0: ffff8881082820e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888134600278 (&c->state_lock){+.+.}-{4:4}, at: __bch2_fs_stop+0xf8/0x900
 #2: ffff88813464af68 (&j->reclaim_lock){+.+.}-{4:4}, at: journal_flush_done+0x86/0x810
 #3: ffff888134604398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7f4/0xd80
 #4: ffff888134604740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x18bd/0x1a40
 #5: ffff888134626710 (&c->gc_lock){.+.+}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0
2 locks held by kworker/1:4/5906:
 #0: ffff88801a482548 ((wq_completion)events_freezable_pwr_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90003d2fbc0 ((work_completion)(&(&ev->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
1 lock held by bch-reclaim/loo/8564:
 #0: ffff88813464af68 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x16b/0x4f0
4 locks held by kworker/1:3H/8690:
 #0: ffff888023895d48 ((wq_completion)bcachefs_btree_write_complete){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90006ae7bc0 ((work_completion)(&wb->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888134604398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: bch2_trans_srcu_lock+0xaf/0x220
 #3: ffff888134626710 (&c->gc_lock){.+.+}-{4:4}, at: bch2_btree_update_start+0x542/0x1de0
1 lock held by syz.4.519/9032:
 #0: ffff8881082820e0 (&type->s_umount_key#52){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.758/10435:
 #0: ffffffff8e13fb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
2 locks held by syz.1.971/11740:
 #0: ffff8881081ff358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_release+0x1a9/0x650
 #1: ffff888107d97910 (&cd->lock){+.+.}-{4:4}, at: sr_block_release+0x4c/0x90

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11740 Comm: syz.1.971 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__alloc_frozen_pages_noprof+0x29e/0x370
Code: 00 0f 00 00 0f 85 e8 fe ff ff 83 3d 43 9b 8d 0d 02 0f 82 d5 fe ff ff 49 81 c4 28 f9 ff ff 4c 89 e0 48 c1 e8 03 42 80 3c 38 00 <74> 10 4c 89 e7 89 54 24 0c e8 64 1e 0d 00 8b 54 24 0c 49 83 3c 24
RSP: 0018:ffffc90002b0f1a0 EFLAGS: 00000246
RAX: 1ffff11027ffef85 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000800 RSI: dffffc0000000000 RDI: ffff88813fff8368
RBP: ffffc90002b0f298 R08: ffffc90002b0f1e0 R09: ffffc90002b0f1b8
R10: ffffc90002b0f1e0 R11: fffff52000561e41 R12: ffff88813fff7c28
R13: 1ffff92000561e38 R14: 0000000000002800 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881a3c15000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7bc6487e20 CR3: 000000000df36000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 alloc_pages_mpol+0x232/0x4a0
 alloc_pages_noprof+0xa9/0x190
 get_free_pages_noprof+0xf/0x80
 __tlb_remove_folio_pages_size+0x2e0/0x5a0
 unmap_page_range+0x20ac/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x430
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6bfbf8eba9
Code: Unable to access opcode bytes at 0x7f6bfbf8eb7f.
RSP: 002b:00007ffccd638ca8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00000000000591ad RCX: 00007f6bfbf8eba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f6bfc1d7da0 R08: 0000000000000001 R09: 0000001ccd638f9f
R10: 0000001b2c120000 R11: 0000000000000246 R12: 00007f6bfc1d5fac
R13: 00007f6bfc1d5fa0 R14: ffffffffffffffff R15: 00007ffccd638dc0
 </TASK>
