bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217 building syzkaller on fc7735a27949755327024847e12dcc1b868bcb99 testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.4.1 20210217 kernel signature: e29d9387b52bbea6102066ccbfbe83568e650270a5560b585f430fc0fc464192 all runs: crashed: INFO: task hung in sync_inodes_sb testing current HEAD eb575cd5d7f60241d016fdd13a9e86d962093c9b testing commit eb575cd5d7f60241d016fdd13a9e86d962093c9b with gcc (GCC) 8.4.1 20210217 kernel signature: 9d43a4fde9942a3bf9ab55d77d10b94ede6f3ead29384bb3a6ad97343af2634d all runs: crashed: INFO: task hung in sync_inodes_sb revisions tested: 2, total time: 31m50.058336969s (build: 17m18.970882824s, test: 14m8.934460188s) the crash still happens on HEAD commit msg: Linux 4.19.195 crash: INFO: task hung in sync_inodes_sb Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout INFO: task syz-executor.2:5924 blocked for more than 140 seconds. Not tainted 4.19.195-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D23752 5924 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x14f/0x1c0 fs/fs-writeback.c:222 sync_inodes_sb+0x183/0x8e0 fs/fs-writeback.c:2479 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x114/0x1f0 fs/sync.c:48 generic_shutdown_super+0x69/0x330 fs/super.c:442 kill_block_super+0x96/0xe0 fs/super.c:1185 deactivate_locked_super+0x77/0xd0 fs/super.c:329 deactivate_super fs/super.c:360 [inline] deactivate_super+0x13f/0x160 fs/super.c:356 cleanup_mnt+0xa3/0x130 fs/namespace.c:1098 __cleanup_mnt+0xd/0x10 fs/namespace.c:1105 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466ca7 Code: Bad RIP value. RSP: 002b:00007fff4d42bef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007fff4d42bfc9 RSI: 0000000000000002 RDI: 00007fff4d42bfc0 RBP: 00007fff4d42bfc0 R08: 00000000ffffffff R09: 00007fff4d42bd90 R10: 00000000015578e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007fff4d42d070 R14: 0000000001557810 R15: 0000000000000002 INFO: task syz-executor.3:5927 blocked for more than 140 seconds. Not tainted 4.19.195-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D22792 5927 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x14f/0x1c0 fs/fs-writeback.c:222 sync_inodes_sb+0x183/0x8e0 fs/fs-writeback.c:2479 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x114/0x1f0 fs/sync.c:48 generic_shutdown_super+0x69/0x330 fs/super.c:442 kill_block_super+0x96/0xe0 fs/super.c:1185 deactivate_locked_super+0x77/0xd0 fs/super.c:329 deactivate_super fs/super.c:360 [inline] deactivate_super+0x13f/0x160 fs/super.c:356 cleanup_mnt+0xa3/0x130 fs/namespace.c:1098 __cleanup_mnt+0xd/0x10 fs/namespace.c:1105 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466ca7 Code: Bad RIP value. RSP: 002b:00007ffe38bda378 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffe38bda449 RSI: 0000000000000002 RDI: 00007ffe38bda440 RBP: 00007ffe38bda440 R08: 00000000ffffffff R09: 00007ffe38bda210 R10: 0000000002c848e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffe38bdb4f0 R14: 0000000002c84810 R15: 0000000000000002 INFO: task syz-executor.4:5929 blocked for more than 140 seconds. Not tainted 4.19.195-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D23576 5929 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x14f/0x1c0 fs/fs-writeback.c:222 sync_inodes_sb+0x183/0x8e0 fs/fs-writeback.c:2479 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x114/0x1f0 fs/sync.c:48 generic_shutdown_super+0x69/0x330 fs/super.c:442 kill_block_super+0x96/0xe0 fs/super.c:1185 deactivate_locked_super+0x77/0xd0 fs/super.c:329 deactivate_super fs/super.c:360 [inline] deactivate_super+0x13f/0x160 fs/super.c:356 cleanup_mnt+0xa3/0x130 fs/namespace.c:1098 __cleanup_mnt+0xd/0x10 fs/namespace.c:1105 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466ca7 Code: Bad RIP value. RSP: 002b:00007ffe641c58a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffe641c5979 RSI: 0000000000000002 RDI: 00007ffe641c5970 RBP: 00007ffe641c5970 R08: 00000000ffffffff R09: 00007ffe641c5740 R10: 00000000026f18e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffe641c6a20 R14: 00000000026f1810 R15: 0000000000000002 INFO: task syz-executor.1:5931 blocked for more than 140 seconds. Not tainted 4.19.195-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D23032 5931 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x14f/0x1c0 fs/fs-writeback.c:222 sync_inodes_sb+0x183/0x8e0 fs/fs-writeback.c:2479 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x114/0x1f0 fs/sync.c:48 generic_shutdown_super+0x69/0x330 fs/super.c:442 kill_block_super+0x96/0xe0 fs/super.c:1185 deactivate_locked_super+0x77/0xd0 fs/super.c:329 deactivate_super fs/super.c:360 [inline] deactivate_super+0x13f/0x160 fs/super.c:356 cleanup_mnt+0xa3/0x130 fs/namespace.c:1098 __cleanup_mnt+0xd/0x10 fs/namespace.c:1105 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466ca7 Code: Bad RIP value. RSP: 002b:00007ffe814b78e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffe814b79b9 RSI: 0000000000000002 RDI: 00007ffe814b79b0 RBP: 00007ffe814b79b0 R08: 00000000ffffffff R09: 00007ffe814b7780 R10: 0000000002c878e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffe814b8a60 R14: 0000000002c87810 R15: 0000000000000002 INFO: task syz-executor.0:5933 blocked for more than 140 seconds. Not tainted 4.19.195-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D23016 5933 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x14f/0x1c0 fs/fs-writeback.c:222 sync_inodes_sb+0x183/0x8e0 fs/fs-writeback.c:2479 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x114/0x1f0 fs/sync.c:48 generic_shutdown_super+0x69/0x330 fs/super.c:442 kill_block_super+0x96/0xe0 fs/super.c:1185 deactivate_locked_super+0x77/0xd0 fs/super.c:329 deactivate_super fs/super.c:360 [inline] deactivate_super+0x13f/0x160 fs/super.c:356 cleanup_mnt+0xa3/0x130 fs/namespace.c:1098 __cleanup_mnt+0xd/0x10 fs/namespace.c:1105 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466ca7 Code: Bad RIP value. RSP: 002b:00007fffa541e218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007fffa541e2e9 RSI: 0000000000000002 RDI: 00007fffa541e2e0 RBP: 00007fffa541e2e0 R08: 00000000ffffffff R09: 00007fffa541e0b0 R10: 00000000030b38e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007fffa541f390 R14: 00000000030b3810 R15: 0000000000000002 INFO: task syz-executor.5:5934 blocked for more than 140 seconds. Not tainted 4.19.195-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D23816 5934 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x14f/0x1c0 fs/fs-writeback.c:222 sync_inodes_sb+0x183/0x8e0 fs/fs-writeback.c:2479 __sync_filesystem fs/sync.c:34 [inline] sync_filesystem fs/sync.c:67 [inline] sync_filesystem+0x114/0x1f0 fs/sync.c:48 generic_shutdown_super+0x69/0x330 fs/super.c:442 kill_block_super+0x96/0xe0 fs/super.c:1185 deactivate_locked_super+0x77/0xd0 fs/super.c:329 deactivate_super fs/super.c:360 [inline] deactivate_super+0x13f/0x160 fs/super.c:356 cleanup_mnt+0xa3/0x130 fs/namespace.c:1098 __cleanup_mnt+0xd/0x10 fs/namespace.c:1105 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x185/0x1e0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x413/0x4e0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466ca7 Code: Bad RIP value. RSP: 002b:00007ffdfd779898 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffdfd779969 RSI: 0000000000000002 RDI: 00007ffdfd779960 RBP: 00007ffdfd779960 R08: 00000000ffffffff R09: 00007ffdfd779730 R10: 00000000018ea8e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffdfd77aa10 R14: 00000000018ea810 R15: 0000000000000002 Showing all locks held in the system: 2 locks held by kworker/u4:0/7: #0: 00000000d0a312b1 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 000000002a03e164 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 2 locks held by kworker/u4:2/87: #0: 00000000d0a312b1 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 00000000c68f85b6 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 1 lock held by khungtaskd/1090: #0: 000000009c50e7b8 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 2 locks held by syz-executor.2/5924: #0: 000000006764f5c6 (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 000000006764f5c6 (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 00000000f0bfc103 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000f0bfc103 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.3/5927: #0: 00000000fa7e471e (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 00000000fa7e471e (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 0000000032d36830 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000032d36830 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.4/5929: #0: 0000000003f1006e (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 0000000003f1006e (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 000000001a3a8bed (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 000000001a3a8bed (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.1/5931: #0: 00000000144d6611 (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 00000000144d6611 (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 0000000059eb26e5 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000059eb26e5 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.0/5933: #0: 00000000460d421b (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 00000000460d421b (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 00000000c4edcd50 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000c4edcd50 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.5/5934: #0: 00000000b2de7aab (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 00000000b2de7aab (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 00000000ae2a3ab1 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000ae2a3ab1 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by kworker/u4:5/7246: #0: 00000000d0a312b1 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 000000007321b667 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 2 locks held by kworker/u4:6/7290: #0: 00000000d0a312b1 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 0000000093df500d ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 2 locks held by kworker/u4:7/7301: #0: 00000000d0a312b1 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 0000000025446a09 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 2 locks held by kworker/u4:8/7333: #0: 00000000d0a312b1 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2124 #1: 00000000d1798a4f ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2128 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1090 Comm: khungtaskd Not tainted 4.19.195-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+0x17c/0x226 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf5/0x120 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 235 Comm: kworker/u4:3 Not tainted 4.19.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_tt_purge RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:2838 [inline] RIP: 0010:lockdep_hardirqs_on+0x2ba/0x5b0 kernel/locking/lockdep.c:2884 Code: df e8 aa 95 ff ff 85 c0 0f 84 c7 00 00 00 48 8d bb 70 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e d2 01 00 00 8b 83 70 08 00 00 85 c0 0f 85 RSP: 0018:ffff8881f455fc50 EFLAGS: 00000802 RAX: 0000000000000000 RBX: ffff8881f454c340 RCX: 1ffff1103e8a9982 RDX: 1ffff1103e8a9976 RSI: ffff8881f454cbf0 RDI: ffff8881f454cbb0 RBP: ffff8881f455fc60 R08: ffff8881f454cc10 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff813936f0 R13: ffff8881f454c340 R14: ffffffff86fb46b0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e1faa7000 CR3: 000000000866d005 CR4: 00000000001606e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_hardirqs_on+0x28/0x190 kernel/trace/trace_preemptirq.c:30 __local_bh_enable_ip+0x160/0x250 kernel/softirq.c:194 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x30/0x40 kernel/locking/spinlock.c:200 spin_unlock_bh include/linux/spinlock.h:374 [inline] batadv_tt_global_purge net/batman-adv/translation-table.c:2541 [inline] batadv_tt_purge+0x290/0x980 net/batman-adv/translation-table.c:3812 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415