syzbot

INFO: task syz.2.92:4026 blocked for more than 143 seconds.
      Not tainted 6.1.106-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.92        state:D stack:25072 pid:4026  ppid:3645   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 io_schedule+0x88/0x100 kernel/sched/core.c:8786
 folio_wait_bit_common+0x878/0x1290 mm/filemap.c:1296
 release_metapage+0x88/0x9b0 fs/jfs/jfs_metapage.c:735
 discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
 __get_metapage+0xb15/0x1040 fs/jfs/jfs_metapage.c:644
 jfs_readdir+0x2907/0x4620 fs/jfs/jfs_dtree.c:3018
 iterate_dir+0x224/0x560
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f379db79e79
RSP: 002b:00007f379e98e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f379dd16058 RCX: 00007f379db79e79
RDX: 0000000000001000 RSI: 0000000020000f80 RDI: 0000000000000006
RBP: 00007f379dbe7916 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f379dd16058 R15: 00007ffdb1f2a098
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d32b190 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d32b990 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/27:
 #0: ffffffff8d32afc0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d32afc0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8d32afc0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6494
1 lock held by syslogd/3075:
2 locks held by getty/3404:
 #0: ffff88814b553098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
2 locks held by syz.2.92/4026:
 #0: ffff888078fe39e8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ba/0x360 fs/file.c:1062
 #1: ffff8880723733c0 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: iterate_dir+0x131/0x560 fs/readdir.c:57

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 6.1.106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf88/0xfd0 kernel/hung_task.c:377
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3632 Comm: syz-executor Not tainted 6.1.106-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__might_resched+0xdb/0x780 kernel/sched/core.c:9917
Code: 33 25 0d 00 75 1f c6 05 6b 33 25 0d 01 48 c7 c7 60 91 0b 8b be bd 26 00 00 48 c7 c2 a0 98 0b 8b e8 1a a0 0a 00 e8 65 41 45 09 <85> c0 74 46 48 c7 c7 40 af 32 8d be ff ff ff ff e8 e0 3d 45 09 85
RSP: 0018:ffffc90003a7f840 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff888028a41dc0
RDX: 0000000000000000 RSI: ffffffff8b0c13e0 RDI: ffffffff8b5d62c0
RBP: ffffc90003a7f950 R08: dffffc0000000000 R09: ffffc90003a7fa00
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffff88802264e000 R14: 0000000000000244 R15: 1ffff9200074ff10
FS:  00005555564b0500(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562ec6fe0fd8 CR3: 0000000072b80000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __mutex_lock_common kernel/locking/mutex.c:580 [inline]
 __mutex_lock+0xbd/0xd80 kernel/locking/mutex.c:747
 __pipe_lock fs/pipe.c:103 [inline]
 pipe_read+0x121/0x12a0 fs/pipe.c:244
 call_read_iter include/linux/fs.h:2259 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x88d/0xbf0 fs/read_write.c:470
 ksys_read+0x19c/0x2c0 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc82957887d
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 78 48 00 00 0f 1f 84 00 00 00 00 00 80 3d c1 3c 17 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffc3aea3428 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00005555564c9100 RCX: 00007fc82957887d
RDX: 0000000000000004 RSI: 00007ffc3aea3490 RDI: 0000000000000016
RBP: 00007ffc3aea3910 R08: 0000000000000007 R09: 00005555564c50e0
R10: f9094f527b813ffe R11: 0000000000000246 R12: 00007ffc3aea3490
R13: 0000000000000001 R14: 00005555564c4600 R15: ffffffffffffffff
 </TASK>