syzbot


INFO: task hung in synchronize_rcu (3)

Status: upstream: reported C repro on 2020/07/22 18:22
Reported-by: syzbot+0c6da80218456f1edc36@syzkaller.appspotmail.com
Fix commit: 2d08935682ac KVM: x86: Don't re-acquire SRCU lock in complete_emulated_io()
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64 ci-upstream-gce-arm64]
First crash: 992d, last: 2d20h

Cause bisection: introduced by (bisect log) :
commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Date: Sat Sep 29 00:59:43 2018 +0000

  tc: Add support for configuring the taprio scheduler

Crash: INFO: rcu detected stall in smp_call_function (log)
Repro: C syz .config

Fix bisection: fixed by (bisect log) :
commit 2d08935682ac5f6bfb70f7e6844ec27d4a245fa4
Author: Sean Christopherson <seanjc@google.com>
Date: Fri Apr 15 00:43:41 2022 +0000

  KVM: x86: Don't re-acquire SRCU lock in complete_emulated_io()

similar bugs (6):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: task hung in synchronize_rcu 1 993d 993d 0/3 auto-closed as invalid on 2020/03/28 16:57
linux-4.14 INFO: task hung in synchronize_rcu C error 157 13h23m 1016d 0/1 upstream: reported C repro on 2019/11/07 04:32
linux-4.19 INFO: task hung in synchronize_rcu syz 62 3d11h 1014d 0/1 upstream: reported syz repro on 2019/11/08 21:27
upstream INFO: task hung in synchronize_rcu syz done 1206 994d 1020d 15/23 fixed on 2019/11/29 15:48
android-414 INFO: task hung in synchronize_rcu 1 1012d 1012d 0/1 auto-closed as invalid on 2020/03/10 10:42
upstream INFO: task hung in synchronize_rcu (2) 8 992d 993d 0/23 closed as invalid on 2019/11/30 16:54
Patch testing requests:
Created Duration User Patch Repo Result
2022/05/11 13:26 17m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 4fa640dc OK
2022/05/10 11:53 7m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 4fa640dc error
2022/05/10 11:08 4m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ 4fa640dc error

Sample crash report:
INFO: task dhcpcd:3675 blocked for more than 143 seconds.
      Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:29120 pid: 3675 ppid:  3179 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5076 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6391
 schedule+0xd2/0x1f0 kernel/sched/core.c:6463
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x5a6/0x610 kernel/rcu/tree_exp.h:927
 synchronize_rcu+0x130/0x190 kernel/rcu/tree.c:3843
 synchronize_net+0x4a/0x50 net/core/dev.c:10649
 __unregister_prot_hook+0x48a/0x5a0 net/packet/af_packet.c:382
 packet_do_bind+0x8bc/0xdc0 net/packet/af_packet.c:3217
 packet_bind+0x152/0x1b0 net/packet/af_packet.c:3301
 __sys_bind+0x1e9/0x250 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1738
 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+0x46/0xb0
RIP: 0033:0x7fa066154ce7
RSP: 002b:00007fffb05bd838 EFLAGS: 00000217 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000560c98ea2b60 RCX: 00007fa066154ce7
RDX: 0000000000000014 RSI: 00007fffb05bd848 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000560c994b4b20 R09: 00007fa066215a60
R10: 0000000000020000 R11: 0000000000000217 R12: 0000560c994b1b60
R13: 0000560c994b4a08 R14: 00007fffb05de11c R15: 00007fffb05de144
 </TASK>
INFO: task dhcpcd:3676 blocked for more than 145 seconds.
      Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D
 stack:29160 pid: 3676 ppid:  3179 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5076 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6391
 schedule+0xd2/0x1f0 kernel/sched/core.c:6463
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x5a6/0x610 kernel/rcu/tree_exp.h:927
 synchronize_rcu+0x130/0x190 kernel/rcu/tree.c:3843
 synchronize_net+0x4a/0x50 net/core/dev.c:10649
 __unregister_prot_hook+0x48a/0x5a0 net/packet/af_packet.c:382
 packet_do_bind+0x8bc/0xdc0 net/packet/af_packet.c:3217
 packet_bind+0x152/0x1b0 net/packet/af_packet.c:3301
 __sys_bind+0x1e9/0x250 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1738
 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+0x46/0xb0
RIP: 0033:0x7fa066154ce7
RSP: 002b:00007fffb05bd838 EFLAGS: 00000217 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000560c98ea2b60 RCX: 00007fa066154ce7
RDX: 0000000000000014 RSI: 00007fffb05bd848 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000560c994b4ca0 R09: 00007fa066215a60
R10: 0000000000020000 R11: 0000000000000217 R12: 0000560c994b1b60
R13: 0000560c994b4b88 R14: 00007fffb05de11c R15: 00007fffb05de144
 </TASK>
INFO: task dhcpcd:3678 blocked for more than 146 seconds.
      Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:29160 pid: 3678 ppid:  3179 flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5076 [inline]
 __schedule+0xa00/0x4b30 kernel/sched/core.c:6391
 schedule+0xd2/0x1f0 kernel/sched/core.c:6463
 exp_funnel_lock kernel/rcu/tree_exp.h:313 [inline]
 synchronize_rcu_expedited+0x5a6/0x610 kernel/rcu/tree_exp.h:927
 synchronize_rcu+0x130/0x190 kernel/rcu/tree.c:3843
 synchronize_net+0x4a/0x50 net/core/dev.c:10649
 __unregister_prot_hook+0x48a/0x5a0 net/packet/af_packet.c:382
 packet_do_bind+0x8bc/0xdc0 net/packet/af_packet.c:3217
 packet_bind+0x152/0x1b0 net/packet/af_packet.c:3301
 __sys_bind+0x1e9/0x250 net/socket.c:1729
 __do_sys_bind net/socket.c:1740 [inline]
 __se_sys_bind net/socket.c:1738 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1738
 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+0x46/0xb0
RIP: 0033:0x7fa066154ce7
RSP: 002b:00007fffb05bd838 EFLAGS: 00000217 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 0000560c98ea2b60 RCX: 00007fa066154ce7
RDX: 0000000000000014 RSI: 00007fffb05bd848 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000560c994b49a0 R09: 00007fa066215a60
R10: 0000000000020000 R11: 0000000000000217 R12: 0000560c994b1b60
R13: 0000560c994b4398 R14: 00007fffb05de11c R15: 00007fffb05de144
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/1:0/22:
9 locks held by kworker/1:1/26:
1 lock held by khungtaskd/28:
 #0: 
ffffffff8bd85460
 (
rcu_read_lock
){....}-{1:2}
, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460
6 locks held by kworker/0:2/141:
9 locks held by kworker/1:3/3264:
2 locks held by getty/3279:
 #0: 
ffff888148712098
 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: 
ffffc90002ce62e8
 (
&ldata->atomic_read_lock
){+.+.}-{3:3}, at: n_tty_read+0xcea/0x1230 drivers/tty/n_tty.c:2075
6 locks held by kworker/1:4/3621:
3 locks held by udevd/3622:
 #0: ffff88807dda0888 (&of->mutex){+.+.}-{3:3}, at: kernfs_file_read_iter fs/kernfs/file.c:198 [inline]
 #0: ffff88807dda0888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_read_iter+0x189/0x6f0 fs/kernfs/file.c:237
 #1: 
ffff88814530fa00 (kn->active#86){++++}-{0:0}, at: kernfs_file_read_iter fs/kernfs/file.c:199 [inline]
ffff88814530fa00 (kn->active#86){++++}-{0:0}, at: kernfs_fop_read_iter+0x1ac/0x6f0 fs/kernfs/file.c:237
 #2: ffff8880167cd220 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:772 [inline]
 #2: ffff8880167cd220 (&dev->mutex){....}-{3:3}, at: read_descriptors+0x3c/0x2c0 drivers/usb/core/sysfs.c:873
6 locks held by kworker/0:3/3625:
1 lock held by dhcpcd/3673:
 #0: 
ffff88801bf84410
 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:732 [inline]
 (&sb->s_type->i_mutex_key#10){+.+.}-{3:3}, at: __sock_release+0x86/0x280 net/socket.c:649
2 locks held by dhcpcd/3674:
 #0: 
ffff8880743f6130
 (
sk_lock-AF_PACKET
){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1682 [inline]
){+.+.}-{0:0}, at: packet_do_bind+0x2f/0xdc0 net/packet/af_packet.c:3184
 #1: 
ffffffff8bd8f760 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline]
ffffffff8bd8f760 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d3/0x610 kernel/rcu/tree_exp.h:927
1 lock held by dhcpcd/3675:
 #0: 
ffff88807dc42130
 (
sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1682 [inline]
sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2f/0xdc0 net/packet/af_packet.c:3184
1 lock held by dhcpcd/3676:
 #0: 
ffff88807dc44130
 (
sk_lock-AF_PACKET
){+.+.}-{0:0}
, at: lock_sock include/net/sock.h:1682 [inline]
, at: packet_do_bind+0x2f/0xdc0 net/packet/af_packet.c:3184
1 lock held by dhcpcd/3678:
 #0: ffff88807dbd0130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1682 [inline]
 #0: ffff88807dbd0130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2f/0xdc0 net/packet/af_packet.c:3184
1 lock held by dhcpcd/3684:
 #0: ffff88807de24130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1682 [inline]
 #0: ffff88807de24130 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2f/0xdc0 net/packet/af_packet.c:3184

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

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #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+0x1e6/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc1d/0xf50 kernel/hung_task.c:369
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3264 Comm: kworker/1:3 Not tainted 5.18.0-syzkaller-02752-gfdaf9a5840ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:__lock_release kernel/locking/lockdep.c:5318 [inline]
RIP: 0010:lock_release+0x217/0x780 kernel/locking/lockdep.c:5654
Code: e8 de 0c ff ff 48 85 c0 48 89 c3 0f 84 c3 03 00 00 48 8d 78 24 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 a7 04 00 00 8b
RSP: 0018:ffffc900001e0de8 EFLAGS: 00000803
RAX: dffffc0000000000 RBX: ffff88801d050b78 RCX: ffffc900001e0e38
RDX: 0000000000000000 RSI: ffffffff8bda5a48 RDI: ffff88801d050b9c
RBP: 1ffff9200003c1bf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffffffff8bda5a48
R13: 0000000000000008 R14: ffff88801d050a58 R15: ffff88801d050000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcbf40228 CR3: 000000001fa4d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline]
 timekeeping_get_delta kernel/time/timekeeping.c:253 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:387 [inline]
 ktime_get_update_offsets_now+0x15e/0x5c0 kernel/time/timekeeping.c:2317
 hrtimer_update_base kernel/time/hrtimer.c:631 [inline]
 hrtimer_interrupt+0x142/0x790 kernel/time/hrtimer.c:1793
 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+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/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 71 e6 4a 00 5d be 03 00 00 00 e9 f6 05 7f 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 e9 dc 88 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc90002f7e850 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801d050000 RSI: ffffffff8160407c RDI: 0000000000000003
RBP: ffffc90002f7e890 R08: 0000000000000000 R09: ffffffff90087937
R10: ffffffff81604072 R11: 0000000000000000 R12: 0000000000000036
R13: ffff888011bbd880 R14: 0000000000000200 R15: ffffc90002f7e9b0
 console_trylock_spinning kernel/printk/printk.c:1908 [inline]
 vprintk_emit+0x3f2/0x5f0 kernel/printk/printk.c:2271
 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4604
 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4615
 __dev_printk+0xcf/0xf5 drivers/base/core.c:4627
 _dev_warn+0xd7/0x109 drivers/base/core.c:4671
 hid_parser_main.cold+0x4f/0xf1 drivers/hid/hid-core.c:633
 hid_open_report+0x37f/0x650 drivers/hid/hid-core.c:1265
 hid_parse include/linux/hid.h:1100 [inline]
 cp_probe+0x5c/0xc0 drivers/hid/hid-cypress.c:135
 hid_device_probe+0x2bd/0x3f0 drivers/hid/hid-core.c:2598
 call_driver_probe drivers/base/dd.c:542 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:621
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:752
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:782
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:899
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:970
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 hid_add_device+0x344/0x9d0 drivers/hid/hid-core.c:2748
 usbhid_probe+0xb49/0x1040 drivers/hid/usbhid/hid-core.c:1424
 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:542 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:621
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:752
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:782
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:899
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:970
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_set_configuration+0x101e/0x1900 drivers/usb/core/message.c:2170
 usb_generic_driver_probe+0xba/0x100 drivers/usb/core/generic.c:238
 usb_probe_device+0xd9/0x2c0 drivers/usb/core/driver.c:293
 call_driver_probe drivers/base/dd.c:542 [inline]
 really_probe+0x23e/0xb20 drivers/base/dd.c:621
 __driver_probe_device+0x338/0x4d0 drivers/base/dd.c:752
 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:782
 __device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:899
 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
 __device_attach+0x228/0x4a0 drivers/base/dd.c:970
 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
 device_add+0xb83/0x1e20 drivers/base/core.c:3405
 usb_new_device.cold+0x641/0x1091 drivers/usb/core/hub.c:2566
 hub_port_connect drivers/usb/core/hub.c:5363 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5507 [inline]
 port_event drivers/usb/core/hub.c:5665 [inline]
 hub_event+0x25c6/0x4680 drivers/usb/core/hub.c:5747
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>
----------------
Code disassembly (best guess):
   0:	e8 de 0c ff ff       	callq  0xffff0ce3
   5:	48 85 c0             	test   %rax,%rax
   8:	48 89 c3             	mov    %rax,%rbx
   b:	0f 84 c3 03 00 00    	je     0x3d4
  11:	48 8d 78 24          	lea    0x24(%rax),%rdi
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 89 fa             	mov    %rdi,%rdx
  22:	48 c1 ea 03          	shr    $0x3,%rdx
  26:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx
* 2a:	48 89 f8             	mov    %rdi,%rax <-- trapping instruction
  2d:	83 e0 07             	and    $0x7,%eax
  30:	83 c0 03             	add    $0x3,%eax
  33:	38 d0                	cmp    %dl,%al
  35:	7c 08                	jl     0x3f
  37:	84 d2                	test   %dl,%dl
  39:	0f 85 a7 04 00 00    	jne    0x4e6
  3f:	8b                   	.byte 0x8b

Crashes (345):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2022/05/25 21:19 upstream fdaf9a5840ac 647c0e27 .config log report syz C INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2022/03/08 13:51 upstream ea4424be1688 7bdd8b2c .config log report syz C INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2022/02/27 14:28 upstream 2293be58d6a1 45a13a73 .config log report syz C INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2022/02/13 07:09 upstream b81b1829e7e3 8b9ca619 .config log report syz C INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2022/03/22 08:11 linux-next f9006d9269ea e2d91b1d .config log report syz C INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-386 2020/07/22 00:02 upstream 4fa640dc5230 21f1765e .config log report syz C
ci-upstream-kasan-gce 2021/10/28 01:40 upstream d25f27432f80 373bf66b .config log report syz INFO: task hung in synchronize_rcu
ci-upstream-net-kasan-gce 2022/05/22 16:13 net-next aa5334b1f968 7268fa62 .config log report syz INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2022/08/16 18:14 linux-next 6c8f479764eb 7a7cb304 .config log report syz INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2022/03/19 12:16 upstream 34e047aa16c0 e2d91b1d .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2022/03/17 02:59 upstream 56e337f2cf13 dfa9a8ed .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-smack-root 2022/02/13 10:30 upstream b81b1829e7e3 8b9ca619 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2022/01/29 17:56 upstream 169387e2aa29 495e00c5 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-smack-root 2022/01/13 09:15 upstream f079ab01b560 44d1319a .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2022/01/10 08:00 upstream df0cc57e057f 2ca0d385 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2022/01/09 17:03 upstream 4634129ad9fd 2ca0d385 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-selinux-root 2021/12/25 07:00 upstream b927dfc67d05 6caa12e4 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2021/12/22 20:59 upstream 3f066e882bf1 6caa12e4 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/14 07:41 upstream ccfff0a2bd2a 83f5c9b5 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/14 05:43 upstream ccfff0a2bd2a 83f5c9b5 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/13 06:22 upstream 7246f4dcaccc 83f5c9b5 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/11 13:14 upstream debe436e77c7 75b04091 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/11 04:08 upstream 89d714ab6043 75b04091 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-smack-root 2021/11/11 00:26 upstream 89d714ab6043 75b04091 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-selinux-root 2021/11/09 17:22 upstream d2f38a3c6507 59bcaf9a .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-smack-root 2021/11/07 04:31 upstream 512b7931ad05 4c1be0be .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-selinux-root 2021/11/05 23:37 upstream fe91c4725aee 4c1be0be .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/05 04:10 upstream 7ddb58cb0eca 4c1be0be .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/04 09:48 upstream ce840177930f 4c1be0be .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-smack-root 2021/11/04 00:06 upstream dcd68326d29b 4c1be0be .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/02 19:31 upstream bfc484fe6abb 17f3edd2 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2021/11/02 10:40 upstream d2fac0afe89f 098b5d53 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/11/02 06:54 upstream e66435936756 098b5d53 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2021/10/23 21:08 upstream 9c0c4d24ac00 282f03fb .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/10/20 09:28 upstream d9abdee5fd5a 466b7db1 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2021/10/12 11:42 upstream fa5878760579 838e7e2c .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce 2021/10/03 22:01 upstream 6761a0ae9895 db0f5787 .config log report info INFO: task hung in synchronize_rcu
ci-qemu2-arm32 2022/07/14 19:15 upstream 4a57a8400075 5d921b08 .config log report info INFO: task hung in synchronize_rcu
ci-qemu2-arm32 2022/07/07 02:47 upstream 9f09069cde34 bff65f44 .config log report info INFO: task hung in synchronize_rcu
ci-qemu2-arm32 2022/06/22 06:58 upstream ca1fdab7fd27 0fc5c330 .config log report info INFO: task hung in synchronize_rcu
ci-qemu2-arm32 2022/03/06 06:09 upstream ac84e82f78cb 7bdd8b2c .config log report info INFO: task hung in synchronize_rcu
ci-qemu2-arm32 2022/02/03 13:51 upstream 88808fbbead4 4ebb2798 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-386 2021/11/06 20:31 upstream fe91c4725aee 4c1be0be .config log report info INFO: task hung in synchronize_rcu
ci-upstream-net-this-kasan-gce 2022/05/25 08:39 net 7fb0269720d7 647c0e27 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce 2021/10/22 08:21 bpf 1acfe7c9b44b 55f90bc6 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce 2021/09/27 21:21 bpf 2248c2fca9c2 78494d16 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce 2021/10/19 14:52 bpf-next 223f903e9c83 24dc29db .config log report info INFO: task hung in synchronize_rcu
ci-upstream-net-kasan-gce 2021/10/16 23:53 net-next 4e6e167bc049 0c5d9412 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-net-kasan-gce 2021/10/15 16:19 net-next 40088915f547 0c5d9412 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce 2021/10/14 05:51 bpf-next 431bfb9ee3e2 5462d470 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce 2021/09/30 14:19 bpf-next 161ecd537948 be530f6c .config log report info INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce 2021/09/28 12:32 bpf-next 4c9f09372046 78494d16 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2022/07/11 22:29 linux-next cb71b93c2dc3 da3d6955 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2022/04/08 03:52 linux-next 2e9a9857569e c6ff3e05 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2021/11/13 12:42 linux-next f2e19fd15bd7 83f5c9b5 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2021/11/10 17:51 linux-next 73e5c18006f5 75b04091 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2021/10/30 04:02 linux-next bdcc9f6a5682 098b5d53 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2021/10/16 17:37 linux-next 7c832d2f9b95 0c5d9412 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2021/09/27 19:28 linux-next bf5b1e621a51 78494d16 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root 2021/09/27 01:42 linux-next 5a5d008887b4 78494d16 .config log report info INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root 2019/12/01 07:56 upstream 32ef9553635a a76bf83f .config log report
ci-upstream-bpf-next-kasan-gce 2021/01/16 01:18 bpf-next eed6a9a9571b 65a7a854 .config log report info
ci-upstream-linux-next-kasan-gce-root 2021/11/13 01:25 linux-next f2e19fd15bd7 83f5c9b5 .config log report info INFO: task can't die in __synchronize_srcu