syzbot


INFO: rcu detected stall in watchdog

Status: upstream: reported C repro on 2022/08/18 21:14
Reported-by: syzbot+0bab26cf3949891fb534@syzkaller.appspotmail.com
First crash: 104d, last: 104d

Cause bisection: failed (bisect log)

Fix bisection: failed (bisect log)
Patch testing requests:
Created Duration User Patch Repo Result
2022/08/19 10:40 18m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 7ebfc85e2cd7 OK log

Sample crash report:
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1495 ticks this GP) idle=01fc/1/0x4000000000000000 softirq=5485/5485 fqs=1
	(t=10501 jiffies g=4273 q=306 ncpus=2)
rcu: rcu_preempt kthread starved for 2302 jiffies! g4273 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:28728 pid:   16 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1935
 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1657
 rcu_gp_kthread+0x236/0x360 kernel/rcu/tree.c:1854
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:format_decode+0x8/0xad0 lib/vsprintf.c:2490
Code: 66 90 e8 ab cc 59 fd 48 c7 c7 60 8a 46 91 e9 3f cc 80 fd 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 57 41 56 41 55 41 54 <55> 48 89 f5 53 48 bb 00 00 00 00 00 fc ff df 48 83 ec 78 48 c7 44
RSP: 0018:ffffc900000071f8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000100
RDX: ffff888016d98000 RSI: ffffc90000007288 RDI: ffffffff8ab16ca0
RBP: ffffffff8ab16ca0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000001 R12: ffffc900000076d6
R13: ffffffff8ab16ca0 R14: 0000000000000000 R15: ffffc90000007360
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd6287e8b4 CR3: 000000001ccaa000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 vsnprintf+0x155/0x14f0 lib/vsprintf.c:2734
 va_format.constprop.0+0x138/0x380 lib/vsprintf.c:1680
 pointer+0x544/0x950 lib/vsprintf.c:2419
 vsnprintf+0x5b2/0x14f0 lib/vsprintf.c:2786
 vprintk_store+0x2d8/0xae0 kernel/printk/printk.c:2155
 vprintk_emit+0x14c/0x5f0 kernel/printk/printk.c:2252
 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4736
 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4747
 __dev_printk+0xcf/0xf5 drivers/base/core.c:4759
 _dev_warn+0xd7/0x109 drivers/base/core.c:4803
 usb_rx_callback_intf0.cold+0x34/0x43 drivers/media/rc/imon.c:1773
 __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1671
 usb_hcd_giveback_urb+0x380/0x430 drivers/usb/core/hcd.c:1754
 dummy_timer+0x11ff/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:1988
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 48 89 ef 5d e9 f1 b5 4b 00 5d be 03 00 00 00 e9 86 04 81 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 29 68 86 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc90000a4fd78 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888016d98000 RSI: ffffffff8161e2a1 RDI: 0000000000000007
RBP: ffffc90000a4fdb8 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000049
R13: ffff8880263cbb00 R14: 0000000000000200 R15: ffffc90000a4fe08
 console_trylock_spinning kernel/printk/printk.c:1922 [inline]
 vprintk_emit+0x3f7/0x5f0 kernel/printk/printk.c:2270
 vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
 _printk+0xba/0xed kernel/printk/printk.c:2292
 check_hung_task kernel/hung_task.c:138 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog.cold+0xf4/0x158 kernel/hung_task.c:369
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.371 msecs
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 1
CPU: 1 PID: 3624 Comm: sshd Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x2c7/0x4d0 kernel/rcu/tree_stall.h:371
 print_cpu_stall kernel/rcu/tree_stall.h:660 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:744 [inline]
 rcu_pending kernel/rcu/tree.c:3660 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x79c kernel/rcu/tree.c:2342
 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 8a 76 dd f7 48 89 ef e8 12 f8 dd f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 13 b9 d0 f7 65 8b 05 3c 72 80 76 85 c0 74 0a 5b 5d c3 e8 30 81
RSP: 0018:ffffc900001e0b28 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff21254ee
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff888147d40000 R08: 0000000000000001 R09: ffffffff908dba17
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888020a0a440
R13: ffff888071066500 R14: dffffc0000000000 R15: ffff8880170a3400
 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
 dummy_timer+0x12fc/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:2002
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
 </IRQ>
 <TASK>
 do_softirq kernel/softirq.c:464 [inline]
 __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:396
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:776 [inline]
 ip_finish_output2+0x7d0/0x2170 net/ipv4/ip_output.c:229
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x19f/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x8de/0x1be0 net/ipv4/ip_output.c:532
 __tcp_transmit_skb+0x1967/0x3800 net/ipv4/tcp_output.c:1402
 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline]
 tcp_write_xmit+0xd89/0x6050 net/ipv4/tcp_output.c:2691
 __tcp_push_pending_frames+0xaa/0x380 net/ipv4/tcp_output.c:2875
 tcp_push+0x499/0x720 net/ipv4/tcp.c:728
 tcp_sendmsg_locked+0x241f/0x2f80 net/ipv4/tcp.c:1455
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1483
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 sock_write_iter+0x291/0x3d0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2192 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:578
 ksys_write+0x1e8/0x250 fs/read_write.c:631
 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+0x63/0xcd
RIP: 0033:0x7f96787259a3

================================
WARNING: inconsistent lock state
5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0 Not tainted
--------------------------------
inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
sshd/3624 [HC1[1]:SC1[1]:HE0:SE0] takes:
ffffffff8c0bee78 (vmap_area_lock){?.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:349 [inline]
ffffffff8c0bee78 (vmap_area_lock){?.+.}-{2:2}, at: find_vmap_area+0x1c/0x130 mm/vmalloc.c:1836
{HARDIRQ-ON-W} state was registered at:
  lock_acquire kernel/locking/lockdep.c:5666 [inline]
  lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
  __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
  _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
  spin_lock include/linux/spinlock.h:349 [inline]
  alloc_vmap_area+0xa0b/0x1d50 mm/vmalloc.c:1617
  __get_vm_area_node+0x142/0x3f0 mm/vmalloc.c:2484
  get_vm_area_caller+0x43/0x50 mm/vmalloc.c:2537
  __ioremap_caller.constprop.0+0x292/0x600 arch/x86/mm/ioremap.c:280
  acpi_os_ioremap include/acpi/acpi_io.h:13 [inline]
  acpi_map drivers/acpi/osl.c:296 [inline]
  acpi_os_map_iomem+0x463/0x550 drivers/acpi/osl.c:355
  acpi_tb_acquire_table+0xd8/0x209 drivers/acpi/acpica/tbdata.c:142
  acpi_tb_validate_table drivers/acpi/acpica/tbdata.c:317 [inline]
  acpi_tb_validate_table+0x50/0x8c drivers/acpi/acpica/tbdata.c:308
  acpi_tb_verify_temp_table+0x84/0x674 drivers/acpi/acpica/tbdata.c:504
  acpi_reallocate_root_table+0x374/0x3e0 drivers/acpi/acpica/tbxface.c:180
  acpi_early_init+0x13a/0x438 drivers/acpi/bus.c:1214
  start_kernel+0x3cf/0x48f init/main.c:1099
  secondary_startup_64_no_verify+0xce/0xdb
irq event stamp: 32301
hardirqs last  enabled at (32300): [<ffffffff8981fd10>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (32300): [<ffffffff8981fd10>] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:194
hardirqs last disabled at (32301): [<ffffffff897ec0bb>] sysvec_apic_timer_interrupt+0xb/0xc0 arch/x86/kernel/apic/apic.c:1106
softirqs last  enabled at (21154): [<ffffffff87d80ef2>] rcu_read_unlock_bh include/linux/rcupdate.h:772 [inline]
softirqs last  enabled at (21154): [<ffffffff87d80ef2>] ip_finish_output2+0x7a2/0x2170 net/ipv4/ip_output.c:229
softirqs last disabled at (21155): [<ffffffff814910ee>] do_softirq.part.0+0xde/0x130 kernel/softirq.c:472

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(vmap_area_lock);
  <Interrupt>
    lock(vmap_area_lock);

 *** DEADLOCK ***

4 locks held by sshd/3624:
 #0: ffff88807a790d30 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1687 [inline]
 #0: ffff88807a790d30 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x1d/0x40 net/ipv4/tcp.c:1482
 #1: ffffffff8bf89240 (rcu_read_lock){....}-{1:2}, at: read_pnet include/net/net_namespace.h:369 [inline]
 #1: ffffffff8bf89240 (rcu_read_lock){....}-{1:2}, at: sock_net include/net/sock.h:618 [inline]
 #1: ffffffff8bf89240 (rcu_read_lock){....}-{1:2}, at: __ip_queue_xmit+0x3d/0x1be0 net/ipv4/ip_output.c:457
 #2: ffffc900001e0d90 ((&dum_hcd->timer)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:31 [inline]
 #2: ffffc900001e0d90 ((&dum_hcd->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 kernel/time/timer.c:1464
 #3: ffffffff8bf93798 (rcu_node_0){-.-.}-{2:2}, at: rcu_dump_cpu_stacks+0xc1/0x4d0 kernel/rcu/tree_stall.h:366

stack backtrace:
CPU: 1 PID: 3624 Comm: sshd Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_usage_bug kernel/locking/lockdep.c:3961 [inline]
 valid_state kernel/locking/lockdep.c:3973 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4176 [inline]
 mark_lock.part.0.cold+0x18/0xd8 kernel/locking/lockdep.c:4632
 mark_lock kernel/locking/lockdep.c:4596 [inline]
 mark_usage kernel/locking/lockdep.c:4524 [inline]
 __lock_acquire+0x14a2/0x56d0 kernel/locking/lockdep.c:5007
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:349 [inline]
 find_vmap_area+0x1c/0x130 mm/vmalloc.c:1836
 check_heap_object mm/usercopy.c:176 [inline]
 __check_object_size mm/usercopy.c:250 [inline]
 __check_object_size+0x1f8/0x700 mm/usercopy.c:212
 check_object_size include/linux/thread_info.h:199 [inline]
 __copy_from_user_inatomic include/linux/uaccess.h:62 [inline]
 copy_from_user_nmi arch/x86/lib/usercopy.c:47 [inline]
 copy_from_user_nmi+0xcb/0x130 arch/x86/lib/usercopy.c:31
 copy_code arch/x86/kernel/dumpstack.c:91 [inline]
 show_opcodes+0x59/0xb0 arch/x86/kernel/dumpstack.c:121
 show_iret_regs+0xd/0x33 arch/x86/kernel/dumpstack.c:149
 __show_regs+0x1e/0x60 arch/x86/kernel/process_64.c:74
 show_trace_log_lvl+0x25b/0x2ba arch/x86/kernel/dumpstack.c:292
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_dump_cpu_stacks+0x2c7/0x4d0 kernel/rcu/tree_stall.h:371
 print_cpu_stall kernel/rcu/tree_stall.h:660 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:744 [inline]
 rcu_pending kernel/rcu/tree.c:3660 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x79c kernel/rcu/tree.c:2342
 update_process_times+0x11a/0x1a0 kernel/time/timer.c:1839
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194
Code: 74 24 10 e8 8a 76 dd f7 48 89 ef e8 12 f8 dd f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 <e8> 13 b9 d0 f7 65 8b 05 3c 72 80 76 85 c0 74 0a 5b 5d c3 e8 30 81
RSP: 0018:ffffc900001e0b28 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff21254ee
RDX: 0000000000000000 RSI: 0000000000000102 RDI: 0000000000000001
RBP: ffff888147d40000 R08: 0000000000000001 R09: ffffffff908dba17
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888020a0a440
R13: ffff888071066500 R14: dffffc0000000000 R15: ffff8880170a3400
 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline]
 dummy_timer+0x12fc/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:2002
 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
 expire_timers kernel/time/timer.c:1519 [inline]
 __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
 __run_timers kernel/time/timer.c:1768 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
 </IRQ>
 <TASK>
 do_softirq kernel/softirq.c:464 [inline]
 __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:396
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:776 [inline]
 ip_finish_output2+0x7d0/0x2170 net/ipv4/ip_output.c:229
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0x19f/0x310 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x8de/0x1be0 net/ipv4/ip_output.c:532
 __tcp_transmit_skb+0x1967/0x3800 net/ipv4/tcp_output.c:1402
 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline]
 tcp_write_xmit+0xd89/0x6050 net/ipv4/tcp_output.c:2691
 __tcp_push_pending_frames+0xaa/0x380 net/ipv4/tcp_output.c:2875
 tcp_push+0x499/0x720 net/ipv4/tcp.c:728
 tcp_sendmsg_locked+0x241f/0x2f80 net/ipv4/tcp.c:1455
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1483
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 sock_write_iter+0x291/0x3d0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2192 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:578
 ksys_write+0x1e8/0x250 fs/read_write.c:631
 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+0x63/0xcd
RIP: 0033:0x7f96787259a3
Code: 8b 15 d9 f4 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
RSP: 002b:00007ffe0d29f248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000034 RCX: 00007f96787259a3
RDX: 0000000000000034 RSI: 00005608a3467640 RDI: 0000000000000004
RBP: 00005608a34758b0 R08: 0000000000000000 R09: 00007ffe0d35a080
R10: 00007ffe0d35a0f0 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000001 R14: 00007ffe0d29f2b8 R15: 00007ffe0d29f338
 </TASK>
Code: 8b 15 d9 f4 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
RSP: 002b:00007ffe0d29f248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000034 RCX: 00007f96787259a3
RDX: 0000000000000034 RSI: 00005608a3467640 RDI: 0000000000000004
RBP: 00005608a34758b0 R08: 0000000000000000 R09: 00007ffe0d35a080
R10: 00007ffe0d35a0f0 R11: 0000000000000246 R12: 0000000000000004
R13: 0000000000000001 R14: 00007ffe0d29f2b8 R15: 00007ffe0d29f338
 </TASK>
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
NMI backtrace for cpu 0
CPU: 0 PID: 2959 Comm: klogd Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0033:0x7f2ac83c87b2
Code: 83 0b 08 5b c3 0f 1f 00 48 8b 47 28 48 39 47 10 48 0f 43 47 10 48 2b 47 18 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 57 <41> 56 41 89 d6 41 55 49 89 f5 41 54 55 89 cd 53 48 89 fb 48 83 ec
RSP: 002b:00007ffe513fd3c0 EFLAGS: 00000202
RAX: 00007f2ac83c87b0 RBX: 0000561c2d7dd910 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000561c2d7dd910
RBP: 0000561c2d7dd910 R08: 00007ffe513fd224 R09: 0000000000000002
R10: 0000000000000010 R11: 0000561c2d7e19f4 R12: 000000000000000c
R13: 0000000000000001 R14: 00007f2ac85bb77d R15: 00007ffe513fd4f8
FS:  00007f2ac82a4800 GS:  0000000000000000

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-root 2022/08/14 21:10 upstream 7ebfc85e2cd7 8dfcaa3d .config log report syz C INFO: rcu detected stall in watchdog
* Struck through repros no longer work on HEAD.