syzbot

INFO: task syz-executor856:5256 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor856 state:D stack:28816 pid:5256  tgid:5243  ppid:5239   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 fdget_pos+0x24e/0x320 fs/file.c:1160
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x1a9/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd14d2ebc9
RSP: 002b:00007fbd14cc4238 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fbd14dc06d8 RCX: 00007fbd14d2ebc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fbd14dc06d0 R08: 00007fff24697067 R09: 00007fbd14cc46c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd14d830c0
R13: 000000000000006e R14: 00007fff24696f80 R15: 00007fff24697068
 </TASK>
INFO: task syz-executor856:5254 blocked for more than 144 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor856 state:D stack:28592 pid:5254  tgid:5244  ppid:5237   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 fdget_pos+0x24e/0x320 fs/file.c:1160
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x1a9/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd14d2ebc9
RSP: 002b:00007fbd14cc4238 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fbd14dc06d8 RCX: 00007fbd14d2ebc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fbd14dc06d0 R08: 00007fff24697067 R09: 00007fbd14cc46c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd14d830c0
R13: 000000000000006e R14: 00007fff24696f80 R15: 00007fff24697068
 </TASK>
INFO: task syz-executor856:5255 blocked for more than 145 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor856 state:D stack:28976 pid:5255  tgid:5245  ppid:5238   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 fdget_pos+0x24e/0x320 fs/file.c:1160
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x1a9/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd14d2ebc9
RSP: 002b:00007fbd14cc4238 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fbd14dc06d8 RCX: 00007fbd14d2ebc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fbd14dc06d0 R08: 00007fbd14cc46c0 R09: 00007fbd14cc46c0
R10: 00007fff24697067 R11: 0000000000000246 R12: 00007fbd14d830c0
R13: 000000000000006e R14: 00007fff24696f80 R15: 00007fff24697068
 </TASK>
INFO: task syz-executor856:5257 blocked for more than 145 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor856 state:D stack:29232 pid:5257  tgid:5246  ppid:5240   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 fdget_pos+0x24e/0x320 fs/file.c:1160
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x1a9/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd14d2ebc9
RSP: 002b:00007fbd14cc4238 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fbd14dc06d8 RCX: 00007fbd14d2ebc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fbd14dc06d0 R08: 00007fff24697067 R09: 00007fbd14cc46c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd14d830c0
R13: 000000000000006e R14: 00007fff24696f80 R15: 00007fff24697068
 </TASK>
INFO: task syz-executor856:5258 blocked for more than 146 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor856 state:D stack:29232 pid:5258  tgid:5248  ppid:5241   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1843/0x4ae0 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 fdget_pos+0x24e/0x320 fs/file.c:1160
 __do_sys_getdents64 fs/readdir.c:403 [inline]
 __se_sys_getdents64+0x1a9/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd14d2ebc9
RSP: 002b:00007fbd14cc4238 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fbd14dc06d8 RCX: 00007fbd14d2ebc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fbd14dc06d0 R08: 00007fff24697067 R09: 00007fbd14cc46c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbd14d830c0
R13: 000000000000006e R14: 00007fff24696f80 R15: 00007fff24697068
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
1 lock held by kswapd0/88:
1 lock held by kswapd1/90:
2 locks held by getty/4972:
 #0: ffff88814ba6d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz-executor856/5250:
1 lock held by syz-executor856/5256:
 #0: ffff88802af41278 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160
2 locks held by syz-executor856/5247:
1 lock held by syz-executor856/5254:
 #0: ffff888028828d38 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160
2 locks held by syz-executor856/5251:
1 lock held by syz-executor856/5255:
 #0: ffff88802d6a90b8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160
2 locks held by syz-executor856/5252:
1 lock held by syz-executor856/5257:
 #0: ffff888011e25278 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160
2 locks held by syz-executor856/5253:
1 lock held by syz-executor856/5258:
 #0: ffff8880292cd0b8 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1160

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5250 Comm: syz-executor856 Not tainted 6.12.0-rc3-syzkaller-00007-g6485cf5ea253 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_preemption_disabled+0x37/0x120
Code: 8b 04 25 28 00 00 00 48 89 44 24 08 65 8b 1d 5c 92 46 74 65 8b 05 51 92 46 74 a9 ff ff ff 7f 74 26 65 48 8b 04 25 28 00 00 00 <48> 3b 44 24 08 0f 85 ce 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e
RSP: 0018:ffffc9000385f3c8 EFLAGS: 00000002
RAX: b6017c0062072400 RBX: 0000000000000000 RCX: b6017c0062072400
RDX: dffffc0000000000 RSI: ffffffff8c0adc40 RDI: ffffffff8c6028a0
RBP: ffffc9000385f558 R08: ffffffff9429285f R09: 1ffffffff285250b
R10: dffffc0000000000 R11: fffffbfff285250c R12: 1ffff9200070be88
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000246
FS:  00007fbd14ce56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b474f5f680 CR3: 000000002bf4c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lockdep_recursion_finish kernel/locking/lockdep.c:467 [inline]
 lock_acquire+0x1fd/0x550 kernel/locking/lockdep.c:5827
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 __find_get_block_slow fs/buffer.c:207 [inline]
 __find_get_block+0x2b1/0x1150 fs/buffer.c:1404
 bdev_getblk+0x33/0x550 fs/buffer.c:1431
 __bread_gfp+0x86/0x400 fs/buffer.c:1491
 sb_bread include/linux/buffer_head.h:346 [inline]
 get_branch+0x2c3/0x6e0 fs/sysv/itree.c:102
 get_block+0x180/0x16d0 fs/sysv/itree.c:222
 block_read_full_folio+0x418/0xcd0 fs/buffer.c:2401
 filemap_read_folio+0x14b/0x630 mm/filemap.c:2367
 do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3825
 read_mapping_folio include/linux/pagemap.h:1011 [inline]
 dir_get_folio fs/sysv/dir.c:64 [inline]
 sysv_readdir+0x193/0x540 fs/sysv/dir.c:93
 iterate_dir+0x571/0x800 fs/readdir.c:108
 __do_sys_getdents64 fs/readdir.c:407 [inline]
 __se_sys_getdents64+0x1d3/0x4a0 fs/readdir.c:392
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbd14d2ebc9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbd14ce5238 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007fbd14dc06c8 RCX: 00007fbd14d2ebc9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fbd14dc06c0 R08: 00007fbd14ce56c0 R09: 00007fbd14ce56c0
R10: 00007fbd14ce56c0 R11: 0000000000000246 R12: 00007fbd14d830c0
R13: 0000000000000006 R14: 00007fff24696f80 R15: 00007fff24697068
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.698 msecs