bisecting cause commit starting from b4f633221f0aeac102e463a4be46a643b2e3b819 building syzkaller on 03d97a1bcdd0542ca2240cf468d9be585cfc06b7 testing commit b4f633221f0aeac102e463a4be46a643b2e3b819 with gcc (GCC) 8.1.0 kernel signature: 9f29aaefd38048c0253d20786540a488d4a1cf0528abc72feb2d158518b5758f run #0: crashed: INFO: rcu detected stall in io_uring_release run #1: crashed: INFO: rcu detected stall in io_uring_release run #2: crashed: INFO: rcu detected stall in io_uring_release run #3: crashed: INFO: rcu detected stall in io_uring_release run #4: crashed: INFO: rcu detected stall in io_uring_release run #5: crashed: INFO: task hung in addrconf_dad_work run #6: crashed: INFO: task hung in linkwatch_event run #7: crashed: INFO: task hung in addrconf_dad_work run #8: crashed: INFO: task hung in addrconf_dad_work run #9: crashed: INFO: task hung in linkwatch_event testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: 9ae9496946a5872eb880ad3139da133d32974a3824f3152ff3e91c17cfa45b70 run #0: crashed: INFO: rcu detected stall in io_uring_release run #1: crashed: INFO: rcu detected stall in io_uring_release run #2: crashed: INFO: rcu detected stall in io_uring_release run #3: crashed: INFO: rcu detected stall in io_uring_release run #4: crashed: INFO: rcu detected stall in io_uring_release run #5: crashed: INFO: rcu detected stall in io_uring_release run #6: crashed: INFO: task hung in fsnotify_mark_destroy_workfn run #7: crashed: INFO: task hung in fsnotify_connector_destroy_workfn run #8: crashed: INFO: task hung in io_finish_async run #9: crashed: BUG: workqueue lockup testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: ec86e41ffc87283cfcd3c7563fd8743567edeb4939ebfb06aee0a9b0a833c366 all runs: OK # git bisect start 7111951b8d4973bda27ff663f2cf18b663d15b48 d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 Bisecting: 6113 revisions left to test after this (roughly 13 steps) [9f68e3655aae6d49d6ba05dd263f99f33c2567af] Merge tag 'drm-next-2020-01-30' of git://anongit.freedesktop.org/drm/drm testing commit 9f68e3655aae6d49d6ba05dd263f99f33c2567af with gcc (GCC) 8.1.0 kernel signature: dba0e430d4d876fd397fce1d7b22d6f63c347e8aad5439e83c35cd5df25db8ae all runs: OK # git bisect good 9f68e3655aae6d49d6ba05dd263f99f33c2567af Bisecting: 3359 revisions left to test after this (roughly 12 steps) [469030d454bd1620c7b2651d9ec8cdcbaa74deb9] Merge tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc testing commit 469030d454bd1620c7b2651d9ec8cdcbaa74deb9 with gcc (GCC) 8.1.0 kernel signature: 2e870d223fd7586d9ce0a75302322ab1f9fbee8cc70d13e9fc11161a8d50f9d7 all runs: OK # git bisect good 469030d454bd1620c7b2651d9ec8cdcbaa74deb9 Bisecting: 1644 revisions left to test after this (roughly 11 steps) [3dc55dba67231fc22352483f5ca737df96cdc1e6] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 3dc55dba67231fc22352483f5ca737df96cdc1e6 with gcc (GCC) 8.1.0 kernel signature: 3e2819284463f2a973165b73c1e6cff234b902001bb7196663d0c282d9dc7fe9 all runs: OK # git bisect good 3dc55dba67231fc22352483f5ca737df96cdc1e6 Bisecting: 805 revisions left to test after this (roughly 10 steps) [62790268e4eda1deaac93264af69ac95b4afdf96] Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc testing commit 62790268e4eda1deaac93264af69ac95b4afdf96 with gcc (GCC) 8.1.0 kernel signature: bb2626f3dc876f07e097ea3484a2fb7c3433dd0ec11c13d03712bd4e309837fa run #0: crashed: INFO: rcu detected stall in io_uring_release run #1: crashed: INFO: rcu detected stall in io_uring_release run #2: crashed: INFO: rcu detected stall in io_uring_release run #3: crashed: INFO: rcu detected stall in io_uring_release run #4: crashed: INFO: rcu detected stall in io_uring_release run #5: crashed: INFO: rcu detected stall in io_uring_release run #6: crashed: INFO: rcu detected stall in io_uring_release run #7: crashed: INFO: rcu detected stall in io_uring_release run #8: crashed: INFO: rcu detected stall in io_uring_release run #9: crashed: INFO: task hung in addrconf_dad_work # git bisect bad 62790268e4eda1deaac93264af69ac95b4afdf96 Bisecting: 418 revisions left to test after this (roughly 9 steps) [bfeb4f9977348daaaf7283ff365d81f7ee95940a] Merge tag 'zonefs-5.6-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/zonefs testing commit bfeb4f9977348daaaf7283ff365d81f7ee95940a with gcc (GCC) 8.1.0 kernel signature: f0b15bdf570358be4f27b9f1d3e6448847519166e799e54703ca668d9bebd2ac run #0: crashed: INFO: rcu detected stall in io_uring_release 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 bfeb4f9977348daaaf7283ff365d81f7ee95940a Bisecting: 201 revisions left to test after this (roughly 8 steps) [c6188dff33fba320826e87e387ae6efffab0525d] Merge tag 'csky-for-linus-5.6-rc3' of git://github.com/c-sky/csky-linux testing commit c6188dff33fba320826e87e387ae6efffab0525d with gcc (GCC) 8.1.0 kernel signature: c9f094aae7ca345626377a93ffd41cde8458e47b369037f4859b938173ee29ab all runs: OK # git bisect good c6188dff33fba320826e87e387ae6efffab0525d Bisecting: 105 revisions left to test after this (roughly 7 steps) [e46bfaba593c36de591a1153746af6bcb40ef67c] Merge tag 'docs-5.6-fixes' of git://git.lwn.net/linux testing commit e46bfaba593c36de591a1153746af6bcb40ef67c with gcc (GCC) 8.1.0 kernel signature: 59821bd0896f8d4d9dc3f2fb3ea98f9c1d10060785501e54d086657feb6382ad all runs: OK # git bisect good e46bfaba593c36de591a1153746af6bcb40ef67c Bisecting: 52 revisions left to test after this (roughly 6 steps) [b82cf17ff1957ec35eaee7dc519c365ecd06ba38] net: phy: marvell: don't interpret PHY status unless resolved testing commit b82cf17ff1957ec35eaee7dc519c365ecd06ba38 with gcc (GCC) 8.1.0 kernel signature: f832e37e6efad4d926c2ba0402d3e214b0681786824707ad72a6a7c9a13baa7c run #0: crashed: INFO: task hung in linkwatch_event 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 b82cf17ff1957ec35eaee7dc519c365ecd06ba38 Bisecting: 26 revisions left to test after this (roughly 5 steps) [9ea4894ba4492c1afeff3142f34bcf9af706a2e1] Merge branch 'master' of git://blackhole.kfki.hu/nf testing commit 9ea4894ba4492c1afeff3142f34bcf9af706a2e1 with gcc (GCC) 8.1.0 kernel signature: f6f5c5748175adf5ff496530c2b054c2aa99d555ed765bad7bd8d09bbe9f80a2 all runs: OK # git bisect good 9ea4894ba4492c1afeff3142f34bcf9af706a2e1 Bisecting: 13 revisions left to test after this (roughly 4 steps) [51e3dfa8906ace90c809235b3d3afebc166b6433] net/smc: fix cleanup for linkgroup setup failures testing commit 51e3dfa8906ace90c809235b3d3afebc166b6433 with gcc (GCC) 8.1.0 kernel signature: f8b67a446b53e67223cae84358252a08a78e1db0df99cf6db805de6e96fda432 all runs: OK # git bisect good 51e3dfa8906ace90c809235b3d3afebc166b6433 Bisecting: 6 revisions left to test after this (roughly 3 steps) [a2f2ef4a54c0d97aa6a8386f4ff23f36ebb488cf] net/smc: check for valid ib_client_data testing commit a2f2ef4a54c0d97aa6a8386f4ff23f36ebb488cf with gcc (GCC) 8.1.0 kernel signature: 8a88995cbcba010636b3bc847c60c1bb83b637e3bbb5321b9ff5d8c2261ea485 all runs: OK # git bisect good a2f2ef4a54c0d97aa6a8386f4ff23f36ebb488cf Bisecting: 3 revisions left to test after this (roughly 2 steps) [386d4716fd91869e07c731657f2cde5a33086516] hinic: fix a bug of rss configuration testing commit 386d4716fd91869e07c731657f2cde5a33086516 with gcc (GCC) 8.1.0 kernel signature: a39ebb84bad756508a0623262c0eae94f91a6540e5a0e34154afbd225f90eab0 run #0: crashed: INFO: task hung in io_finish_async 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 386d4716fd91869e07c731657f2cde5a33086516 Bisecting: 0 revisions left to test after this (roughly 1 step) [d2ed69ce9ed3477e2a9527e6b89fe4689d99510e] hinic: fix a bug of setting hw_ioctxt testing commit d2ed69ce9ed3477e2a9527e6b89fe4689d99510e with gcc (GCC) 8.1.0 kernel signature: b0fdac0ea44ad260e66cd72911a0107f4be69aefad67b52993d5ed21d0758dbb all runs: OK # git bisect good d2ed69ce9ed3477e2a9527e6b89fe4689d99510e 386d4716fd91869e07c731657f2cde5a33086516 is the first bad commit commit 386d4716fd91869e07c731657f2cde5a33086516 Author: Luo bin Date: Thu Feb 27 06:34:44 2020 +0000 hinic: fix a bug of rss configuration should use real receive queue number to configure hw rss indirect table rather than maximal queue number Signed-off-by: Luo bin Signed-off-by: David S. Miller drivers/net/ethernet/huawei/hinic/hinic_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) culprit signature: a39ebb84bad756508a0623262c0eae94f91a6540e5a0e34154afbd225f90eab0 parent signature: b0fdac0ea44ad260e66cd72911a0107f4be69aefad67b52993d5ed21d0758dbb revisions tested: 16, total time: 4h11m32.192118579s (build: 1h41m15.397452433s, test: 2h29m7.910743075s) first bad commit: 386d4716fd91869e07c731657f2cde5a33086516 hinic: fix a bug of rss configuration cc: ["aviad.krawczyk@huawei.com" "davem@davemloft.net" "linux-kernel@vger.kernel.org" "luobin9@huawei.com" "netdev@vger.kernel.org"] crash: INFO: task hung in io_finish_async INFO: task syz-executor.1:19101 blocked for more than 143 seconds. Not tainted 5.6.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28192 19101 7148 0x00004004 Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x56c/0x970 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x25f/0x3c0 kernel/sched/completion.c:136 kthread_park+0xd4/0x130 kernel/kthread.c:520 io_sq_thread_stop fs/io_uring.c:5366 [inline] io_finish_async+0x8e/0x190 fs/io_uring.c:5374 io_ring_ctx_free fs/io_uring.c:6334 [inline] io_ring_ctx_wait_and_kill+0x394/0x970 fs/io_uring.c:6431 io_uring_release+0x39/0x50 fs/io_uring.c:6439 __fput+0x256/0x780 fs/file_table.c:280 task_work_run+0x103/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x23d/0x2d0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4f8/0x5e0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416421 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffc95abb450 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416421 RDX: 0000000000000001 RSI: 0000000000790578 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc95abb540 R11: 0000000000000293 R12: 0000000000790768 R13: 0000000000029ed2 R14: ffffffffffffffff R15: 000000000078bfac INFO: task syz-executor.5:19102 blocked for more than 143 seconds. Not tainted 5.6.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28192 19102 7153 0x00004004 Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x56c/0x970 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x25f/0x3c0 kernel/sched/completion.c:136 kthread_park+0xd4/0x130 kernel/kthread.c:520 io_sq_thread_stop fs/io_uring.c:5366 [inline] io_finish_async+0x8e/0x190 fs/io_uring.c:5374 io_ring_ctx_free fs/io_uring.c:6334 [inline] io_ring_ctx_wait_and_kill+0x394/0x970 fs/io_uring.c:6431 io_uring_release+0x39/0x50 fs/io_uring.c:6439 __fput+0x256/0x780 fs/file_table.c:280 task_work_run+0x103/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x23d/0x2d0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4f8/0x5e0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x416421 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffe222850f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000416421 RDX: 0000000000000001 RSI: 0000000000790578 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffe222851e0 R11: 0000000000000293 R12: 0000000000790768 R13: 0000000000029ee4 R14: ffffffffffffffff R15: 000000000078bfac INFO: task syz-executor.3:19111 blocked for more than 143 seconds. Not tainted 5.6.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D29856 19111 7145 0x00004004 Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x56c/0x970 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x25f/0x3c0 kernel/sched/completion.c:136 io_sq_thread_stop fs/io_uring.c:5360 [inline] io_finish_async+0x67/0x190 fs/io_uring.c:5374 io_sq_offload_start fs/io_uring.c:6018 [inline] io_uring_create fs/io_uring.c:6898 [inline] io_uring_setup+0xe19/0x1e40 fs/io_uring.c:6960 do_syscall_64+0xc6/0x5e0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdfe5c75c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00000000004e0bc0 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 00000000000000f1 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000204 R14: 00000000004c425f R15: 00007fdfe5c766d4 INFO: task syz-executor.0:19121 blocked for more than 143 seconds. Not tainted 5.6.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29088 19121 7150 0x80004002 Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4154 schedule_timeout+0x56c/0x970 kernel/time/timer.c:1871 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x25f/0x3c0 kernel/sched/completion.c:136 kthread_park+0xd4/0x130 kernel/kthread.c:520 io_sq_thread_stop fs/io_uring.c:5366 [inline] io_finish_async+0x8e/0x190 fs/io_uring.c:5374 io_ring_ctx_free fs/io_uring.c:6334 [inline] io_ring_ctx_wait_and_kill+0x394/0x970 fs/io_uring.c:6431 io_uring_release+0x39/0x50 fs/io_uring.c:6439 __fput+0x256/0x780 fs/file_table.c:280 task_work_run+0x103/0x180 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9b5/0x2a10 kernel/exit.c:801 do_group_exit+0xeb/0x2d0 kernel/exit.c:899 get_signal+0x36c/0x1d40 kernel/signal.c:2734 do_signal+0x81/0x13f0 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x10f/0x2d0 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4f8/0x5e0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1f0c5dcc78 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: 0000000000000003 RBX: 00000000004e0bc0 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 00000000000000f1 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000204 R14: 00000000004c425f R15: 00007f1f0c5dd6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1134: #0: ffffffff88ba6040 (rcu_read_lock){....}, at: debug_show_all_locks+0x52/0x28d kernel/locking/lockdep.c:5331 3 locks held by kworker/1:3/2794: #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: process_one_work+0x80f/0x15c0 kernel/workqueue.c:2235 #1: ffffc900082d7e00 (deferred_process_work){+.+.}, at: process_one_work+0x844/0x15c0 kernel/workqueue.c:2239 #2: ffffffff896ca7e0 (rtnl_mutex){+.+.}, at: switchdev_deferred_process_work+0x5/0x10 net/switchdev/switchdev.c:74 3 locks held by kworker/1:4/2834: #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:226 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa426d28 ((wq_completion)events){+.+.}, at: process_one_work+0x80f/0x15c0 kernel/workqueue.c:2235 #1: ffffc900084e7e00 ((linkwatch_work).work){+.+.}, at: process_one_work+0x844/0x15c0 kernel/workqueue.c:2239 #2: ffffffff896ca7e0 (rtnl_mutex){+.+.}, at: linkwatch_event+0x5/0x50 net/core/link_watch.c:242 3 locks held by kworker/0:7/4067: 1 lock held by in:imklog/6550: #0: ffff8880926b26a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x96/0xb0 fs/file.c:821 2 locks held by syz-executor.0/7150: #0: ffffffff896ca7e0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:737 [inline] #0: ffffffff896ca7e0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x34/0x140 drivers/net/tun.c:3459 #1: ffffffff88b64a70 (cpu_hotplug_lock.rw_sem){++++}, at: get_online_cpus include/linux/cpu.h:137 [inline] #1: ffffffff88b64a70 (cpu_hotplug_lock.rw_sem){++++}, at: flush_all_backlogs net/core/dev.c:5519 [inline] #1: ffffffff88b64a70 (cpu_hotplug_lock.rw_sem){++++}, at: rollback_registered_many+0x3be/0xd10 net/core/dev.c:8795 1 lock held by syz-executor.4/7152: #0: ffffffff896ca7e0 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:737 [inline] #0: ffffffff896ca7e0 (rtnl_mutex){+.+.}, at: tun_chr_close+0x34/0x140 drivers/net/tun.c:3459 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1134 Comm: khungtaskd Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x128/0x182 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x83 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x183/0x1ac lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x629/0xc70 kernel/hung_task.c:289 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 19123 Comm: syz-executor.4 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_ring_ctx_wait_and_kill+0xd7/0x970 fs/io_uring.c:6416 Code: c1 ec 03 48 01 c5 49 01 c4 eb 1d f0 83 44 24 fc 00 41 80 3c 24 00 0f 85 4d 07 00 00 49 8b 85 58 01 00 00 48 39 c3 75 16 f3 90 <80> 7d 00 00 0f 85 51 07 00 00 49 83 bd 10 01 00 00 00 75 cd 49 8d RSP: 0018:ffffc900054c7a20 EFLAGS: 00000246 RAX: ffff88809eb79158 RBX: ffff88809eb79158 RCX: ffffffff8713d012 RDX: 1ffff11013d6f22b RSI: 0000000000000008 RDI: ffff88809eb792c0 RBP: ffffed1013d6f222 R08: ffffed1013d6f259 R09: ffffed1013d6f259 R10: ffffed1013d6f258 R11: ffff88809eb792c7 R12: ffffed1013d6f22b R13: ffff88809eb79000 R14: ffff88809eb79110 R15: ffff88821b77b960 FS: 00007fa01aad1700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004fa210 CR3: 0000000008a6d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: io_uring_release+0x39/0x50 fs/io_uring.c:6439 __fput+0x256/0x780 fs/file_table.c:280 task_work_run+0x103/0x180 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9b5/0x2a10 kernel/exit.c:801 do_group_exit+0xeb/0x2d0 kernel/exit.c:899 get_signal+0x36c/0x1d40 kernel/signal.c:2734 do_signal+0x81/0x13f0 arch/x86/kernel/signal.c:813 exit_to_usermode_loop+0x10f/0x2d0 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4f8/0x5e0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007fa01aad0c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: 0000000000000003 RBX: 00000000004e0bc0 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 00000000000000f1 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000204 R14: 00000000004c425f R15: 00007fa01aad16d4