syzbot

INFO: task syz-executor.3:24376 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc3-syzkaller-00029-g9fd6ba5420ba #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:27992 pid:24376 ppid:23749  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0x173b/0x4630 kernel/sched/core.c:6622
 schedule+0xc3/0x180 kernel/sched/core.c:6698
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757
 rwsem_down_write_slowpath+0xedd/0x13a0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:758 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x7ba/0x3170 fs/namei.c:3712
 do_filp_open+0x234/0x490 fs/namei.c:3742
 do_sys_openat2+0x13f/0x500 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f740ee8c0f9
RSP: 002b:00007f740fb55168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f740efac050 RCX: 00007f740ee8c0f9
RDX: 000000000000275a RSI: 0000000020000280 RDI: ffffffffffffff9c
RBP: 00007f740eee7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc71eaa33f R14: 00007f740fb55300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:24379 blocked for more than 143 seconds.
      Not tainted 6.3.0-rc3-syzkaller-00029-g9fd6ba5420ba #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:27776 pid:24379 ppid:23749  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0x173b/0x4630 kernel/sched/core.c:6622
 schedule+0xc3/0x180 kernel/sched/core.c:6698
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757
 rwsem_down_read_slowpath+0x5f4/0x950 kernel/locking/rwsem.c:1086
 __down_read_common+0x61/0x2c0 kernel/locking/rwsem.c:1250
 inode_lock_shared include/linux/fs.h:768 [inline]
 open_last_lookups fs/namei.c:3483 [inline]
 path_openat+0x7ab/0x3170 fs/namei.c:3712
 do_filp_open+0x234/0x490 fs/namei.c:3742
 do_sys_openat2+0x13f/0x500 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f740ee8c0f9
RSP: 002b:00007f740fb34168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f740efac120 RCX: 00007f740ee8c0f9
RDX: 0000000000044280 RSI: 0000000020000180 RDI: ffffffffffffff9c
RBP: 00007f740eee7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc71eaa33f R14: 00007f740fb34300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.3:24391 blocked for more than 144 seconds.
      Not tainted 6.3.0-rc3-syzkaller-00029-g9fd6ba5420ba #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:27992 pid:24391 ppid:23749  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5304 [inline]
 __schedule+0x173b/0x4630 kernel/sched/core.c:6622
 schedule+0xc3/0x180 kernel/sched/core.c:6698
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757
 rwsem_down_write_slowpath+0xedd/0x13a0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:758 [inline]
 open_last_lookups fs/namei.c:3481 [inline]
 path_openat+0x7ba/0x3170 fs/namei.c:3712
 do_filp_open+0x234/0x490 fs/namei.c:3742
 do_sys_openat2+0x13f/0x500 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f740ee8c0f9
RSP: 002b:00007f7404ebc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f740efac460 RCX: 00007f740ee8c0f9
RDX: 000000000000275a RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f740eee7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc71eaa33f R14: 00007f7404ebc300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cf255f0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8cf25df0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xd20 kernel/rcu/tasks.h:510
1 lock held by khungtaskd/28:
 #0: ffffffff8cf25420 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:2/41:
 #0: ffff8880b993be98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:539
 #1: ffff8880b9928788 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:976
2 locks held by getty/4744:
 #0: ffff88802c8e1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc900015a02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ab/0x1db0 drivers/tty/n_tty.c:2177
5 locks held by syz-executor.3/24365:
2 locks held by syz-executor.3/24376:
 #0: ffff888087e10460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3481 [inline]
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7ba/0x3170 fs/namei.c:3712
2 locks held by syz-executor.3/24379:
 #0: ffff888087e10460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3483 [inline]
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7ab/0x3170 fs/namei.c:3712
2 locks held by syz-executor.3/24391:
 #0: ffff888087e10460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3481 [inline]
 #1: ffff8880332402a8 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7ba/0x3170 fs/namei.c:3712
5 locks held by syz-executor.0/26392:
2 locks held by syz-executor.0/26394:
 #0: ffff888078426460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3481 [inline]
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7ba/0x3170 fs/namei.c:3712
2 locks held by syz-executor.0/26395:
 #0: ffff888078426460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline]
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3483 [inline]
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7ab/0x3170 fs/namei.c:3712
2 locks held by syz-executor.0/26408:
 #0: ffff888078426460 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3481 [inline]
 #1: ffff888076ece2c0 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7ba/0x3170 fs/namei.c:3712

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-rc3-syzkaller-00029-g9fd6ba5420ba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x187/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xec2/0xf00 kernel/hung_task.c:379
 kthread+0x270/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 24365 Comm: syz-executor.3 Not tainted 6.3.0-rc3-syzkaller-00029-g9fd6ba5420ba #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3726 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3745 [inline]
RIP: 0010:validate_chain+0x1a0/0x58e0 kernel/locking/lockdep.c:3800
Code: 89 df e8 e3 4b 75 00 48 89 5c 24 20 48 8b 1b 48 85 db 74 48 48 83 c3 f8 74 42 4c 8d 7b 18 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 <74> 08 4c 89 ff e8 b6 4b 75 00 49 8b 07 4c 39 f0 0f 84 dc 03 00 00
RSP: 0018:ffffc90005ca6c60 EFLAGS: 00000046
RAX: 1ffffffff209a2db RBX: ffffffff904d16c0 RCX: ffffffff816ad269
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff902df308
RBP: ffffc90005ca6f10 R08: dffffc0000000000 R09: fffffbfff205be62
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffff88802f88e2b8 R14: f77fe0e2a5e83f5f R15: ffffffff904d16d8
FS:  00007f740fb76700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0028ee200 CR3: 000000008128c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1573
 nilfs_bmap_insert+0xa2/0x3b0 fs/nilfs2/bmap.c:146
 nilfs_mdt_insert_new_block fs/nilfs2/mdt.c:44 [inline]
 nilfs_mdt_create_block fs/nilfs2/mdt.c:93 [inline]
 nilfs_mdt_get_block+0x36f/0xa50 fs/nilfs2/mdt.c:255
 nilfs_palloc_get_block+0x142/0x240 fs/nilfs2/alloc.c:216
 nilfs_palloc_get_desc_block fs/nilfs2/alloc.c:265 [inline]
 nilfs_palloc_prepare_alloc_entry+0x3e4/0xfe0 fs/nilfs2/alloc.c:524
 nilfs_ifile_create_inode+0x9d/0x2d0 fs/nilfs2/ifile.c:64
 nilfs_new_inode+0x257/0xa30 fs/nilfs2/inode.c:347
 nilfs_create+0xfd/0x2c0 fs/nilfs2/namei.c:85
 lookup_open fs/namei.c:3416 [inline]
 open_last_lookups fs/namei.c:3484 [inline]
 path_openat+0x13df/0x3170 fs/namei.c:3712
 do_filp_open+0x234/0x490 fs/namei.c:3742
 do_sys_openat2+0x13f/0x500 fs/open.c:1348
 do_sys_open fs/open.c:1364 [inline]
 __do_sys_openat fs/open.c:1380 [inline]
 __se_sys_openat fs/open.c:1375 [inline]
 __x64_sys_openat+0x247/0x290 fs/open.c:1375
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f740ee8c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f740fb76168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f740efabf80 RCX: 00007f740ee8c0f9
RDX: 000000000000275a RSI: 0000000020000280 RDI: ffffffffffffff9c
RBP: 00007f740eee7b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc71eaa33f R14: 00007f740fb76300 R15: 0000000000022000
 </TASK>