syzbot

INFO: task syz-executor.1:22313 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:26384 pid:22313 tgid:22304 ppid:5104   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:802 [inline]
 open_last_lookups fs/namei.c:3543 [inline]
 path_openat+0x7bc/0x3290 fs/namei.c:3776
 do_filp_open+0x234/0x490 fs/namei.c:3809
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_open fs/open.c:1463 [inline]
 __se_sys_open fs/open.c:1459 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1459
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f36d727cae9
RSP: 002b:00007f36d7f580c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f36d739c050 RCX: 00007f36d727cae9
RDX: 0000000000000000 RSI: 0000000000060142 RDI: 0000000020000000
RBP: 00007f36d72c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f36d739c050 R15: 00007fff58378ab8
 </TASK>
INFO: task syz-executor.1:22316 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:27824 pid:22316 tgid:22304 ppid:5104   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0x149/0x260 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 inode_lock include/linux/fs.h:802 [inline]
 open_last_lookups fs/namei.c:3543 [inline]
 path_openat+0x7bc/0x3290 fs/namei.c:3776
 do_filp_open+0x234/0x490 fs/namei.c:3809
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1440
 do_sys_open fs/open.c:1455 [inline]
 __do_sys_open fs/open.c:1463 [inline]
 __se_sys_open fs/open.c:1459 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1459
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f36d727cae9
RSP: 002b:00007f36d7f370c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f36d739c120 RCX: 00007f36d727cae9
RDX: 0000000000000000 RSI: 0000000000060142 RDI: 0000000020000000
RBP: 00007f36d72c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f36d739c120 R15: 00007fff58378ab8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4820:
 #0: ffff88814bcba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
5 locks held by syz-executor.1/22305:
1 lock held by syz-executor.1/22313:
 #0: ffff88803faa3140 (&type->i_mutex_dir_key#23){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #0: ffff88803faa3140 (&type->i_mutex_dir_key#23){++++}-{3:3}, at: open_last_lookups fs/namei.c:3543 [inline]
 #0: ffff88803faa3140 (&type->i_mutex_dir_key#23){++++}-{3:3}, at: path_openat+0x7bc/0x3290 fs/namei.c:3776
1 lock held by syz-executor.1/22316:
 #0: ffff88803faa3140 (&type->i_mutex_dir_key#23){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
 #0: ffff88803faa3140 (&type->i_mutex_dir_key#23){++++}-{3:3}, at: open_last_lookups fs/namei.c:3543 [inline]
 #0: ffff88803faa3140 (&type->i_mutex_dir_key#23){++++}-{3:3}, at: path_openat+0x7bc/0x3290 fs/namei.c:3776
1 lock held by syz-executor.1/23221:
 #0: ffff8880361d00e0 (&type->s_umount_key#25){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
 #0: ffff8880361d00e0 (&type->s_umount_key#25){++++}-{3:3}, at: super_lock+0x176/0x3a0 fs/super.c:117

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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+0x198/0x310 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfaf/0xff0 kernel/hung_task.c:379
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 781 Comm: kworker/1:2 Not tainted 6.7.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:stack_trace_consume_entry+0x0/0x280 kernel/stacktrace.c:83
Code: 00 e9 5a ff ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 7b ff ff ff 48 89 df e8 bc 98 6e 00 e9 6e ff ff ff e8 32 4d 9b 09 66 90 <f3> 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 fb 48
RSP: 0018:ffffc900036bf598 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffffffff813336b8 RCX: ffff88801c2fd940
RDX: 0000000000000000 RSI: ffffffff813336b8 RDI: ffffc900036bf680
RBP: ffffc900036bf630 R08: ffffffff8134e4dc R09: ffffffff813dc790
R10: 0000000000000003 R11: ffff88801c2fd940 R12: ffff88801c2fd940
R13: ffffffff817be950 R14: ffffc900036bf680 R15: ffffc900036bf5a0
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563f3fd0b188 CR3: 000000000d730000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 arch_stack_walk+0x13a/0x1a0 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x117/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4f/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6c/0x3c0 mm/slab.h:763
 slab_alloc_node mm/slub.c:3478 [inline]
 kmem_cache_alloc_node+0x1dd/0x310 mm/slub.c:3523
 __alloc_skb+0x181/0x420 net/core/skbuff.c:641
 alloc_skb include/linux/skbuff.h:1286 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x250/0xa90 drivers/net/netdevsim/dev.c:850
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703
 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>