syzbot


INFO: task hung in drm_gem_prime_fd_to_handle

Status: closed as invalid on 2022/02/08 09:50
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 351d, last: 342d

Sample crash report:
INFO: task syz-executor.3:17669 blocked for more than 143 seconds.
      Not tainted 5.16.0-rc5-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:28496 pid:17669 ppid:  4880 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6253
 schedule+0xd2/0x260 kernel/sched/core.c:6326
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385
 __mutex_lock_common kernel/locking/mutex.c:680 [inline]
 __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740
 drm_gem_prime_fd_to_handle+0x1b9/0x550 drivers/gpu/drm/drm_prime.c:316
 drm_prime_fd_to_handle_ioctl+0x9b/0xd0 drivers/gpu/drm/drm_prime.c:374
 drm_ioctl_kernel+0x27d/0x4e0 drivers/gpu/drm/drm_ioctl.c:782
 drm_ioctl+0x51e/0x9d0 drivers/gpu/drm/drm_ioctl.c:885
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fa3f9fcee99
RSP: 002b:00007fa3f8944168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa3fa0e1f60 RCX: 00007fa3f9fcee99
RDX: 00000000200004c0 RSI: 00000000c00c642e RDI: 0000000000000004
RBP: 00007fa3fa028ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffff16ef19f R14: 00007fa3f8944300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: ffffffff8bb83de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458
2 locks held by syslogd/2952:
 #0: ffff8880b9c39a98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2b/0x120 kernel/sched/core.c:478
 #1: ffff8880b9c279c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a6/0x490 kernel/sched/psi.c:880
2 locks held by getty/3279:
 #0: ffff88802360c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002ba32e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113
3 locks held by syz-executor.2/17643:
 #0: ffff88807cab23d8 (&prime_fpriv->lock){+.+.}-{3:3}, at: drm_gem_prime_fd_to_handle+0x5e/0x550 drivers/gpu/drm/drm_prime.c:308
 #1: ffff88801a7aac70 (&dev->object_name_lock){+.+.}-{3:3}, at: drm_gem_prime_fd_to_handle+0x1b9/0x550 drivers/gpu/drm/drm_prime.c:316
 #2: ffff88801def4298 (&shmem->pages_lock){+.+.}-{3:3}, at: drm_gem_shmem_get_pages+0x56/0x250 drivers/gpu/drm/drm_gem_shmem_helper.c:203
2 locks held by syz-executor.3/17669:
 #0: ffff88807cab13d8 (&prime_fpriv->lock){+.+.}-{3:3}, at: drm_gem_prime_fd_to_handle+0x5e/0x550 drivers/gpu/drm/drm_prime.c:308
 #1: ffff88801a7aac70 (&dev->object_name_lock){+.+.}-{3:3}, at: drm_gem_prime_fd_to_handle+0x1b9/0x550 drivers/gpu/drm/drm_prime.c:316

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

NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:295
 kthread+0x405/0x4f0 kernel/kthread.c:327
 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: 7737 Comm: kworker/u4:13 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: phy22 ieee80211_iface_work
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:106 [inline]
RIP: 0010:lock_is_held_type+0x51/0x140 kernel/locking/lockdep.c:5676
Code: bd 76 85 c0 0f 85 ca 00 00 00 65 4c 8b 24 25 40 70 02 00 41 8b 94 24 5c 0a 00 00 85 d2 0f 85 b1 00 00 00 48 89 fd 41 89 f6 9c <8f> 04 24 fa 48 c7 c7 a0 0f ac 89 31 db e8 1d 0e 00 00 41 8b 84 24
RSP: 0018:ffffc9000409f668 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc9000409fa38 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8bb83d20
RBP: ffffffff8bb83d20 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff88783709 R11: 0000000000000000 R12: ffff88802bc81d00
R13: 00000000ffffffff R14: 00000000ffffffff R15: ffff88807b8c05c0
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c0135361a0 CR3: 00000000149dd000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x3a/0x70 kernel/rcu/update.c:125
 trace_cfg80211_inform_bss_frame net/wireless/trace.h:3325 [inline]
 cfg80211_inform_single_bss_frame_data+0xbac/0xee0 net/wireless/scan.c:2340
 cfg80211_inform_bss_frame_data+0xa7/0xb50 net/wireless/scan.c:2458
 ieee80211_bss_info_update+0x35b/0xb30 net/mac80211/scan.c:190
 ieee80211_rx_bss_info net/mac80211/ibss.c:1119 [inline]
 ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1610 [inline]
 ieee80211_ibss_rx_queued_mgmt+0x19cf/0x3130 net/mac80211/ibss.c:1639
 ieee80211_iface_process_skb net/mac80211/iface.c:1468 [inline]
 ieee80211_iface_work+0xa65/0xd00 net/mac80211/iface.c:1522
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	bd 76 85 c0 0f       	mov    $0xfc08576,%ebp
   5:	85 ca                	test   %ecx,%edx
   7:	00 00                	add    %al,(%rax)
   9:	00 65 4c             	add    %ah,0x4c(%rbp)
   c:	8b 24 25 40 70 02 00 	mov    0x27040,%esp
  13:	41 8b 94 24 5c 0a 00 	mov    0xa5c(%r12),%edx
  1a:	00
  1b:	85 d2                	test   %edx,%edx
  1d:	0f 85 b1 00 00 00    	jne    0xd4
  23:	48 89 fd             	mov    %rdi,%rbp
  26:	41 89 f6             	mov    %esi,%r14d
  29:	9c                   	pushfq
* 2a:	8f 04 24             	popq   (%rsp) <-- trapping instruction
  2d:	fa                   	cli
  2e:	48 c7 c7 a0 0f ac 89 	mov    $0xffffffff89ac0fa0,%rdi
  35:	31 db                	xor    %ebx,%ebx
  37:	e8 1d 0e 00 00       	callq  0xe59
  3c:	41                   	rex.B
  3d:	8b                   	.byte 0x8b
  3e:	84                   	.byte 0x84
  3f:	24                   	.byte 0x24

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2021/12/19 13:42 upstream 3f667b5d4053 44068e19 .config log report info INFO: task hung in drm_gem_prime_fd_to_handle
ci-upstream-kasan-gce-smack-root 2021/12/18 04:03 upstream 6441998e2e37 44068e19 .config log report info INFO: task hung in drm_gem_prime_fd_to_handle
ci-upstream-kasan-gce-root 2021/12/12 15:06 upstream a763d5a5abd6 49ca1f59 .config log report info INFO: task hung in drm_gem_prime_fd_to_handle
ci-upstream-kasan-gce-smack-root 2021/12/10 03:20 upstream c741e49150db 4d4ce9bc .config log report info INFO: task hung in drm_gem_prime_fd_to_handle
* Struck through repros no longer work on HEAD.