syzbot


INFO: task hung in path_openat

Status: auto-obsoleted due to no activity on 2023/10/23 12:08
Reported-by: syzbot+6543f8265dc75e2a9639@syzkaller.appspotmail.com
First crash: 331d, last: 229d
Similar bugs (15)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in path_openat 2 1630d 1663d 0/1 auto-closed as invalid on 2020/01/11 07:40
upstream INFO: task hung in path_openat (4) fuse 1 1401d 1401d 0/26 auto-closed as invalid on 2020/07/28 10:23
upstream INFO: task hung in path_openat (3) fs 4 1561d 1677d 0/26 auto-closed as invalid on 2020/02/19 20:16
linux-6.1 INFO: task hung in path_openat (2) 1 61d 61d 0/3 upstream: reported on 2023/12/30 11:38
upstream INFO: task hung in path_openat (7) fs 231 21d 511d 0/26 upstream: reported on 2022/10/06 10:29
linux-4.19 INFO: task hung in path_openat (2) 1 830d 830d 0/1 auto-closed as invalid on 2022/03/21 04:47
linux-4.14 INFO: task hung in path_openat 1 1070d 1070d 0/1 auto-closed as invalid on 2021/07/23 23:26
android-49 INFO: task hung in path_openat 64 1801d 1782d 0/3 auto-closed as invalid on 2019/09/22 08:41
upstream INFO: task hung in path_openat (5) fs 23 1042d 1203d 0/26 auto-closed as invalid on 2021/07/22 20:44
linux-4.19 INFO: task hung in path_openat (3) f2fs jfs 20 407d 567d 0/1 upstream: reported on 2022/08/11 13:14
upstream INFO: task hung in path_openat (6) fs 13 777d 927d 0/26 closed as invalid on 2022/02/07 19:19
android-414 INFO: task hung in path_openat 42 1705d 1783d 0/1 auto-closed as invalid on 2019/10/28 21:04
upstream INFO: task hung in path_openat exfat 246 1869d 2159d 0/26 closed as dup on 2018/09/08 15:37
linux-5.15 INFO: task hung in path_openat C error 3 212d 323d 0/3 auto-obsoleted due to no activity on 2023/11/09 20:56
upstream INFO: task hung in path_openat (2) fs 1 1772d 1772d 0/26 closed as invalid on 2019/05/08 13:05

Sample crash report:
INFO: task syz-executor.2:4126 blocked for more than 143 seconds.
      Not tainted 6.1.38-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:28280 pid:4126  ppid:3590   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x132c/0x4330 kernel/sched/core.c:6554
 schedule+0xbf/0x180 kernel/sched/core.c:6630
 rwsem_down_write_slowpath+0xe93/0x14a0 kernel/locking/rwsem.c:1189
 inode_lock include/linux/fs.h:756 [inline]
 open_last_lookups fs/namei.c:3478 [inline]
 path_openat+0x7b6/0x2e60 fs/namei.c:3711
 do_filp_open+0x230/0x480 fs/namei.c:3741
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f75e5c7cb29
RSP: 002b:00007f75e6a020c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f75e5d9c050 RCX: 00007f75e5c7cb29
RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 00007f75e5cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f75e5d9c050 R15: 00007ffe5ec2de08
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8cf29630 (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: ffffffff8cf29e30 (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: ffffffff8cf29460 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3298:
 #0: ffff88807efb8098 (&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:2177
6 locks held by kworker/1:6/3640:
 #0: ffff888144ab4538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0
 #1: ffffc9000430fd20 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2264
 #2: ffff888145bcd190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #2: ffff888145bcd190 (&dev->mutex){....}-{3:3}, at: hub_event+0x20e/0x57b0 drivers/usb/core/hub.c:5683
 #3: ffff88807da44190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #3: ffff88807da44190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x570 drivers/base/dd.c:988
 #4: ffff888084c12118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:836 [inline]
 #4: ffff888084c12118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8a/0x570 drivers/base/dd.c:988
 #5: ffff8881457f9b68 (hcd->bandwidth_mutex){+.+.}-{3:3}, at: usb_set_interface+0x35a/0x1390 drivers/usb/core/message.c:1564
2 locks held by syz-executor.2/4123:
2 locks held by syz-executor.2/4126:
 #0: ffff88809a8c6460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
 #1: ffff888089ade6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff888089ade6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: open_last_lookups fs/namei.c:3478 [inline]
 #1: ffff888089ade6c0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: path_openat+0x7b6/0x2e60 fs/namei.c:3711
1 lock held by kworker/u4:8/4411:
 #0: ffff8880b9839e18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
2 locks held by dhcpcd/6213:
 #0: ffff8880992ea130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1733 [inline]
 #0: ffff8880992ea130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xc40 net/packet/af_packet.c:3194
 #1: ffffffff8cf2ea38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
 #1: ffffffff8cf2ea38 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3b0/0x8a0 kernel/rcu/tree_exp.h:950

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.38-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
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+0xf18/0xf60 kernel/hung_task.c:377
 kthread+0x26e/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25961 Comm: syz-executor.3 Not tainted 6.1.38-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:check_preemption_disabled+0x0/0x110 lib/smp_processor_id.c:13
Code: 00 5c fc 8c 48 89 de e8 be 87 db f9 e9 6d ff ff ff cc cc cc cc cc cc cc cc cc 48 c7 c7 00 ce 3c 8b 48 c7 c6 40 ce 3c 8b eb 00 <41> 57 41 56 41 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89
RSP: 0018:ffffc9000327f7d8 EFLAGS: 00000046
RAX: 0000000080000000 RBX: ffff888022f5c1c0 RCX: 0000000000000000
RDX: ffff888022f5c1c0 RSI: ffffffff8b3cce40 RDI: ffffffff8b3cce00
RBP: 0000000000000000 R08: 000000000000000c R09: 0000000000000001
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880124413c0
R13: ffff888022f5c1c0 R14: ffff8880124413c0 R15: 0000000000000286
FS:  000055555742f480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee31579478 CR3: 000000007910f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 kasan_quarantine_put+0x3e/0x220 mm/kasan/quarantine.c:217
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674
 xt_free_table_info+0x65/0x150 net/netfilter/x_tables.c:1208
 __do_replace+0x7f9/0xa60 net/ipv4/netfilter/ip_tables.c:1086
 do_replace net/ipv4/netfilter/ip_tables.c:1139 [inline]
 do_ipt_set_ctl+0x2840/0x3d90 net/ipv4/netfilter/ip_tables.c:1629
 nf_setsockopt+0x28a/0x2b0 net/netfilter/nf_sockopt.c:101
 __sys_setsockopt+0x57e/0xa00 net/socket.c:2252
 __do_sys_setsockopt net/socket.c:2263 [inline]
 __se_sys_setsockopt net/socket.c:2260 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2260
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fee3147e87a
Code: ff ff ff c3 0f 1f 40 00 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 b0 ff ff ff f7
RSP: 002b:00007fff8960de58 EFLAGS: 00000202 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fff8960dee0 RCX: 00007fee3147e87a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000408 R09: 00007fff8960e297
R10: 00007fee31579ae0 R11: 0000000000000202 R12: 00007fee31579a80
R13: 00007fff8960de7c R14: 0000000000000000 R15: 00007fee3157aec0
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/07/15 12:08 linux-6.1.y 61fd484b2cf6 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in path_openat
2023/04/24 11:47 linux-6.1.y f17b0ab65d17 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in path_openat
2023/04/04 07:33 linux-6.1.y 3b29299e5f60 41147e3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in path_openat
* Struck through repros no longer work on HEAD.