bisecting cause commit starting from a68a0262abdaa251e12c53715f48e698a18ef402 building syzkaller on c090b4da255257841173fb4eb18c19d69b293180 testing commit a68a0262abdaa251e12c53715f48e698a18ef402 with gcc (GCC) 8.1.0 kernel signature: 92ef7a502368e377159912c7c622157146508e579cf0bdc44fb3a796a2749f5d run #0: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #1: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor863828614" "root@10.128.1.43:./syz-executor863828614"]: exit status 1 ssh: connect to host 10.128.1.43 port 22: Connection timed out lost connection run #2: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor520795403" "root@10.128.15.228:./syz-executor520795403"]: exit status 1 ssh: connect to host 10.128.15.228 port 22: Connection timed out lost connection run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK reproducer seems to be flaky testing release v5.9 testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 8.1.0 kernel signature: ae997c81c8480492441e712d3c127e3da959156d4e937c464609e101fa84e28c all runs: OK # git bisect start a68a0262abdaa251e12c53715f48e698a18ef402 bbf5c979011a099af5dc76498918ed7df445635b Bisecting: 9331 revisions left to test after this (roughly 13 steps) [4d0e9df5e43dba52d38b251e3b909df8fa1110be] lib, uaccess: add failure injection to usercopy functions testing commit 4d0e9df5e43dba52d38b251e3b909df8fa1110be with gcc (GCC) 8.1.0 kernel signature: 19d651166031891e1c42f1a0518e05f408372acef30d76f75e5b6df6eabbfcd1 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 4d0e9df5e43dba52d38b251e3b909df8fa1110be Bisecting: 3935 revisions left to test after this (roughly 12 steps) [f888bdf9823c85fe945c4eb3ba353f749dec3856] Merge tag 'devicetree-for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux testing commit f888bdf9823c85fe945c4eb3ba353f749dec3856 with gcc (GCC) 8.1.0 kernel signature: 380506a17205c0f6ebc50411e3c2c3f5322dc2f2d915cb86cb02fabae50d49d3 run #0: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad f888bdf9823c85fe945c4eb3ba353f749dec3856 Bisecting: 1997 revisions left to test after this (roughly 11 steps) [57218d7f2e87069f73c7a841b6ed6c1cc7acf616] Merge tag 'regmap-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap testing commit 57218d7f2e87069f73c7a841b6ed6c1cc7acf616 with gcc (GCC) 8.1.0 kernel signature: 2122c4728350db5a8b65268cb76043df2bca3142fb24ad47216fa0e3b461d7d7 run #0: crashed: BUG: soft lockup in __hrtimer_run_queues run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 57218d7f2e87069f73c7a841b6ed6c1cc7acf616 Bisecting: 873 revisions left to test after this (roughly 10 steps) [39a5101f989e8d2be557136704d53990f9b402c8] Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 testing commit 39a5101f989e8d2be557136704d53990f9b402c8 with gcc (GCC) 8.1.0 kernel signature: 1f73da9c24c6cd6e358faf36f3de66b45706a82b6bbe5c484b2c3feeb8ee67d4 run #0: crashed: BUG: soft lockup in __hrtimer_run_queues run #1: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor989090525" "root@10.128.15.205:./syz-executor989090525"]: exit status 1 Connection timed out during banner exchange lost connection run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 39a5101f989e8d2be557136704d53990f9b402c8 Bisecting: 521 revisions left to test after this (roughly 9 steps) [ed016af52ee3035b4799ebd7d53f9ae59d5782c4] Merge tag 'locking-core-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit ed016af52ee3035b4799ebd7d53f9ae59d5782c4 with gcc (GCC) 8.1.0 kernel signature: 8684ac24fb35a0bc25f8e326780c8c1a4a5eac5ab4f77e8e331834672a4961bd run #0: crashed: BUG: soft lockup in corrupted run #1: crashed: INFO: rcu detected stall in call_usermodehelper_exec_work run #2: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor613730115" "root@10.128.15.211:./syz-executor613730115"]: exit status 1 Connection timed out during banner exchange lost connection run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad ed016af52ee3035b4799ebd7d53f9ae59d5782c4 Bisecting: 274 revisions left to test after this (roughly 8 steps) [f94ab231136c53ee26b1ddda76b29218018834ff] Merge tag 'x86_cleanups_for_v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit f94ab231136c53ee26b1ddda76b29218018834ff with gcc (GCC) 8.1.0 kernel signature: 53e7e3673b71f28ee2de951082d0e97f4993567811bda1d6344ff7b5e0560695 run #0: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad f94ab231136c53ee26b1ddda76b29218018834ff Bisecting: 124 revisions left to test after this (roughly 7 steps) [baab853229ec1f291cec6a70ed61ce93159d0997] Merge branch 'for-next/mte' into for-next/core testing commit baab853229ec1f291cec6a70ed61ce93159d0997 with gcc (GCC) 8.1.0 kernel signature: 5c71602c571a998a222cab36402fff71ad2c8b6deb0a1f9ac48469d92825ba75 run #0: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #1: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor839827768" "root@10.128.15.196:./syz-executor839827768"]: exit status 1 ssh: connect to host 10.128.15.196 port 22: Connection timed out lost connection run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad baab853229ec1f291cec6a70ed61ce93159d0997 Bisecting: 53 revisions left to test after this (roughly 6 steps) [57b8b1b4351dafe94de09a2aab5eba885b6705f0] Merge branches 'for-next/acpi', 'for-next/boot', 'for-next/bpf', 'for-next/cpuinfo', 'for-next/fpsimd', 'for-next/misc', 'for-next/mm', 'for-next/pci', 'for-next/perf', 'for-next/ptrauth', 'for-next/sdei', 'for-next/selftests', 'for-next/stacktrace', 'for-next/svm', 'for-next/topology', 'for-next/tpyos' and 'for-next/vdso' into for-next/core testing commit 57b8b1b4351dafe94de09a2aab5eba885b6705f0 with gcc (GCC) 8.1.0 kernel signature: 2485031f17570b392d072ea3a96e24401778d88be2042b939ca5ccb2e1ca3f1b run #0: crashed: INFO: rcu detected stall in mac80211_hwsim_beacon run #1: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #2: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor703641580" "root@10.128.0.253:./syz-executor703641580"]: exit status 1 ssh: connect to host 10.128.0.253 port 22: Connection timed out lost connection run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 57b8b1b4351dafe94de09a2aab5eba885b6705f0 Bisecting: 69 revisions left to test after this (roughly 6 steps) [887e2cff0f8dc4dac4c35e631b711325c6dd65b8] perf: arm-cmn: Fix conversion specifiers for node type testing commit 887e2cff0f8dc4dac4c35e631b711325c6dd65b8 with gcc (GCC) 8.1.0 kernel signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f run #0: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor566143761" "root@10.128.15.209:./syz-executor566143761"]: exit status 1 ssh: connect to host 10.128.15.209 port 22: Connection timed out lost connection run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect good 887e2cff0f8dc4dac4c35e631b711325c6dd65b8 Bisecting: 56 revisions left to test after this (roughly 5 steps) [4b2b76cbbc8ff5dabc18123d94a1125143aea567] firmware: arm_sdei: Remove _sdei_event_unregister() testing commit 4b2b76cbbc8ff5dabc18123d94a1125143aea567 with gcc (GCC) 8.1.0 kernel signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f run #0: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 4b2b76cbbc8ff5dabc18123d94a1125143aea567 Bisecting: 6 revisions left to test after this (roughly 3 steps) [bc110fd322816c9684603a55404b51228c0feca8] firmware: arm_sdei: Remove duplicate check in sdei_get_conduit() testing commit bc110fd322816c9684603a55404b51228c0feca8 with gcc (GCC) 8.1.0 kernel signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: BUG: soft lockup in mac80211_hwsim_beacon run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad bc110fd322816c9684603a55404b51228c0feca8 Bisecting: 2 revisions left to test after this (roughly 2 steps) [663c0e89c8defd75a9d34ae31dbc315d6cf894bd] firmware: arm_sdei: Retrieve event number from event instance testing commit 663c0e89c8defd75a9d34ae31dbc315d6cf894bd with gcc (GCC) 8.1.0 kernel signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: BUG: soft lockup in ieee80211_tasklet_handler run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect bad 663c0e89c8defd75a9d34ae31dbc315d6cf894bd Bisecting: 0 revisions left to test after this (roughly 1 step) [119884249fdba34a06df250a4402a6b2f3697a47] firmware: arm_sdei: Common block for failing path in sdei_event_create() testing commit 119884249fdba34a06df250a4402a6b2f3697a47 with gcc (GCC) 8.1.0 kernel signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f run #0: basic kernel testing failed: failed to copy test binary to VM: failed to run ["scp" "-P" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "BatchMode=yes" "-o" "IdentitiesOnly=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "-i" "/syzkaller/jobs/linux/workdir/image/key" "/tmp/syz-executor369880430" "root@10.128.15.204:./syz-executor369880430"]: exit status 1 ssh: connect to host 10.128.15.204 port 22: Connection timed out lost connection run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK # git bisect good 119884249fdba34a06df250a4402a6b2f3697a47 663c0e89c8defd75a9d34ae31dbc315d6cf894bd is the first bad commit commit 663c0e89c8defd75a9d34ae31dbc315d6cf894bd Author: Gavin Shan Date: Tue Sep 22 23:04:13 2020 +1000 firmware: arm_sdei: Retrieve event number from event instance In sdei_event_create(), the event number is retrieved from the variable @event_num for the shared event. The event number was stored in the event instance. So we can fetch it from the event instance, similar to what we're doing for the private event. Signed-off-by: Gavin Shan Reviewed-by: Jonathan Cameron Acked-by: James Morse Link: https://lore.kernel.org/r/20200922130423.10173-4-gshan@redhat.com Signed-off-by: Will Deacon drivers/firmware/arm_sdei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) culprit signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f parent signature: 67bce2d41885559d1ab311525c4050ae61c3c436c169c7a104233cebf858cf1f Reproducer flagged being flaky revisions tested: 15, total time: 3h47m14.81013947s (build: 1h7m20.297645713s, test: 2h38m31.453838496s) first bad commit: 663c0e89c8defd75a9d34ae31dbc315d6cf894bd firmware: arm_sdei: Retrieve event number from event instance recipients (to): ["gshan@redhat.com" "james.morse@arm.com" "jonathan.cameron@huawei.com" "will@kernel.org"] recipients (cc): [] crash: BUG: soft lockup in ieee80211_tasklet_handler watchdog: BUG: soft lockup - CPU#0 stuck for 134s! [syz-executor.4:15018] Modules linked in: irq event stamp: 27944371 hardirqs last enabled at (27944370): [] asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:611 hardirqs last disabled at (27944371): [] irqentry_enter+0x1d/0x50 kernel/entry/common.c:319 softirqs last enabled at (24347842): [] __do_softirq+0x3c6/0x579 kernel/softirq.c:325 softirqs last disabled at (24347845): [] asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 CPU: 0 PID: 15018 Comm: syz-executor.4 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_is_held_type+0xb2/0xf0 kernel/locking/lockdep.c:5050 Code: e0 03 39 c8 0f 94 c0 0f b6 c0 65 48 8b 0c 25 00 70 01 00 8b 91 e4 08 00 00 83 ea 01 66 85 d2 89 91 e4 08 00 00 75 2a 41 57 9d <48> 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 31 c0 eb cd 48 83 c4 RSP: 0018:ffffc90000003d28 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff88812e0dbb10 RCX: ffff88812e0db200 RDX: 0000000000000000 RSI: ffffffff84b0eea0 RDI: ffff88812e0dbb10 RBP: ffff88812e0db200 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88812e0db200 R11: 0000000000000246 R12: ffffffff84b0eea0 R13: ffff88812e0dbae8 R14: 0000000000000001 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe672c5527 CR3: 000000011c5bd000 CR4: 0000000000350ef0 Call Trace: lock_is_held include/linux/lockdep.h:267 [inline] rcu_read_lock_held+0x4d/0x60 kernel/rcu/update.c:322 __rhashtable_lookup include/linux/rhashtable.h:594 [inline] rhltable_lookup include/linux/rhashtable.h:688 [inline] sta_info_hash_lookup net/mac80211/sta_info.c:162 [inline] sta_info_get_bss+0x2c5/0x400 net/mac80211/sta_info.c:199 __ieee80211_rx_handle_packet net/mac80211/rx.c:4657 [inline] ieee80211_rx_list+0x3a2/0xad0 net/mac80211/rx.c:4778 ieee80211_rx_napi+0x85/0x1a0 net/mac80211/rx.c:4799 ieee80211_rx include/net/mac80211.h:4435 [inline] ieee80211_tasklet_handler+0xb8/0xc0 net/mac80211/main.c:235 tasklet_action_common.isra.13+0x1bf/0x210 kernel/softirq.c:559 __do_softirq+0xd8/0x579 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x73/0x90 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0xbb/0xe0 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x57/0xe0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:mm_update_next_owner+0x179/0x280 kernel/exit.c:387 Code: ff 48 c7 c7 80 00 a9 84 48 8b 87 d8 03 00 00 48 8d b8 28 fc ff ff 48 81 ff 80 00 a9 84 0f 84 82 00 00 00 f6 80 4e fc ff ff 20 <75> dc 48 8b b0 60 03 00 00 48 8b 56 10 48 83 c6 10 4c 8d ba 68 fa RSP: 0018:ffffc9000387fd38 EFLAGS: 00000202 RAX: ffff88811e7e03d8 RBX: ffff88812e0db6f8 RCX: 00000000e6c0928c RDX: ffff88812d905140 RSI: ffff88813a31e010 RDI: ffff88811e7e0000 RBP: ffff88812e0db200 R08: 0000000000000001 R09: 0000000000000000 R10: ffff88812e0db200 R11: 0000000000000246 R12: 0000000000000000 R13: ffff88813ad8d780 R14: ffff88813ad8d838 R15: ffff888127cb0000 exit_mm kernel/exit.c:482 [inline] do_exit+0x372/0xcc0 kernel/exit.c:793 do_group_exit+0x42/0xb0 kernel/exit.c:903 get_signal+0x176/0xcc0 kernel/signal.c:2757 arch_do_signal+0x2b/0x8e0 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:136 [inline] exit_to_user_mode_prepare+0xff/0x1c0 kernel/entry/common.c:167 syscall_exit_to_user_mode+0x3c/0x270 kernel/entry/common.c:242 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e159 Code: Bad RIP value. RSP: 002b:00007f5c458eac68 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: 0000000000000004 RBX: 0000000000000005 RCX: 000000000045e159 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 000000002001d000 RBP: 000000000119bfd0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc6b2522bf R14: 00007f5c458eb9c0 R15: 000000000119bf8c Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8849 Comm: syz-executor.1 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:queued_write_lock_slowpath+0x3a/0xa0 kernel/locking/qrwlock.c:77 Code: f0 0f b1 57 04 75 60 8b 03 85 c0 74 4b f0 81 03 00 01 00 00 b9 ff 00 00 00 be 00 01 00 00 8b 13 81 fa 00 01 00 00 74 0c f3 90 <8b> 13 81 fa 00 01 00 00 75 f4 89 f0 f0 0f b1 0b 3d 00 01 00 00 75 RSP: 0018:ffffc90000e97cb8 EFLAGS: 00000006 RAX: 0000000000000200 RBX: ffffffff84a05080 RCX: 00000000000000ff RDX: 0000000000000300 RSI: 0000000000000100 RDI: ffffffff84a05080 RBP: ffffffff84a05084 R08: 0000000000000001 R09: 0000000000000000 R10: ffff888127cb1900 R11: 0000000000000046 R12: 0000000000000010 R13: 0000000000000000 R14: dead000000000122 R15: ffff88813a8c3200 FS: 000000000293c940(0000) GS:ffff88813bd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052e3cc CR3: 000000013b3d5000 CR4: 0000000000350ee0 Call Trace: queued_write_lock include/asm-generic/qrwlock.h:95 [inline] do_raw_write_lock+0xa4/0xb0 kernel/locking/spinlock_debug.c:207 release_task.part.20+0xc1/0x690 kernel/exit.c:195 release_task kernel/exit.c:1088 [inline] wait_task_zombie kernel/exit.c:1088 [inline] wait_consider_task+0xc8c/0xe20 kernel/exit.c:1315 do_wait_thread kernel/exit.c:1378 [inline] do_wait+0x11c/0x330 kernel/exit.c:1449 kernel_wait4+0x99/0x140 kernel/exit.c:1621 __do_sys_wait4+0x83/0x90 kernel/exit.c:1649 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417d4b Code: 54 55 41 89 d4 53 48 89 f5 89 fb 48 83 ec 10 e8 7b f9 ff ff 45 31 d2 41 89 c0 49 63 d4 48 89 ee 48 63 fb b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 19 44 89 c7 89 44 24 0c e8 b1 f9 ff ff 8b 44 RSP: 002b:00007ffd6659ba60 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 0000000000417d4b RDX: 0000000040000001 RSI: 00007ffd6659bac0 RDI: ffffffffffffffff RBP: 00007ffd6659bac0 R08: 0000000000000000 R09: 000000000293c940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000040000001 R13: 00007ffd6659bac0 R14: 00007ffd6659bad0 R15: 000000000001a058