bisecting fixing commit since a1b977b49b66c75e6c51a515f6700371ae720217 building syzkaller on fc7735a27949755327024847e12dcc1b868bcb99 testing commit a1b977b49b66c75e6c51a515f6700371ae720217 with gcc (GCC) 8.4.1 20210217 kernel signature: e1b627d6e89e7068c2af96e01db4152946884dd433474f21fc77c7b13d77685d all runs: crashed: INFO: task hung in sync_inodes_sb testing current HEAD 125222814e7b8f84df767d6ab622aff2a6d2f234 testing commit 125222814e7b8f84df767d6ab622aff2a6d2f234 with gcc (GCC) 8.4.1 20210217 kernel signature: 0033402cfdd8e244488eb2aa2f9fe690887fe44ed7c820ab2449e3167c97e1c4 all runs: crashed: INFO: task hung in sync_inodes_sb revisions tested: 2, total time: 30m33.251663987s (build: 16m20.00993069s, test: 13m49.864143004s) the crash still happens on HEAD commit msg: Linux 4.19.182 crash: INFO: task hung in sync_inodes_sb Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci0: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout INFO: task syz-executor.2:5898 blocked for more than 140 seconds. Not tainted 4.19.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D23608 5898 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:00007ffcc9ff0878 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffcc9ff0949 RSI: 0000000000000002 RDI: 00007ffcc9ff0940 RBP: 00007ffcc9ff0940 R08: 00000000ffffffff R09: 00007ffcc9ff0710 R10: 0000000001aac8e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffcc9ff19f0 R14: 0000000001aac810 R15: 0000000000000002 INFO: task syz-executor.3:5899 blocked for more than 140 seconds. Not tainted 4.19.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D23704 5899 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:00007ffe767ec278 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffe767ec349 RSI: 0000000000000002 RDI: 00007ffe767ec340 RBP: 00007ffe767ec340 R08: 00000000ffffffff R09: 00007ffe767ec110 R10: 0000000001dc98e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffe767ed3f0 R14: 0000000001dc9810 R15: 0000000000000002 INFO: task syz-executor.0:5901 blocked for more than 140 seconds. Not tainted 4.19.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D23384 5901 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:00007ffc2b9bbc38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffc2b9bbd09 RSI: 0000000000000002 RDI: 00007ffc2b9bbd00 RBP: 00007ffc2b9bbd00 R08: 00000000ffffffff R09: 00007ffc2b9bbad0 R10: 0000000002c1e8e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffc2b9bcdb0 R14: 0000000002c1e810 R15: 0000000000000002 INFO: task syz-executor.4:5903 blocked for more than 140 seconds. Not tainted 4.19.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D23816 5903 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:00007fff8c00f908 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007fff8c00f9d9 RSI: 0000000000000002 RDI: 00007fff8c00f9d0 RBP: 00007fff8c00f9d0 R08: 00000000ffffffff R09: 00007fff8c00f7a0 R10: 000000000341a8e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007fff8c010a80 R14: 000000000341a810 R15: 0000000000000002 INFO: task syz-executor.5:5905 blocked for more than 140 seconds. Not tainted 4.19.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D23128 5905 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:00007ffe8842d408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffe8842d4d9 RSI: 0000000000000002 RDI: 00007ffe8842d4d0 RBP: 00007ffe8842d4d0 R08: 00000000ffffffff R09: 00007ffe8842d2a0 R10: 000000000156b8e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffe8842e580 R14: 000000000156b810 R15: 0000000000000002 INFO: task syz-executor.1:5906 blocked for more than 140 seconds. Not tainted 4.19.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D23816 5906 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:00007ffcde57d088 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000466ca7 RDX: 00007ffcde57d159 RSI: 0000000000000002 RDI: 00007ffcde57d150 RBP: 00007ffcde57d150 R08: 00000000ffffffff R09: 00007ffcde57cf20 R10: 00000000022238e3 R11: 0000000000000246 R12: 00000000004ae4c5 R13: 00007ffcde57e200 R14: 0000000002223810 R15: 0000000000000002 Showing all locks held in the system: 2 locks held by kworker/u4:1/23: #0: 00000000ec5f14ae ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 000000009eed1785 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 2 locks held by kworker/u4:3/536: #0: 00000000ec5f14ae ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 00000000168bdb03 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 1 lock held by khungtaskd/1097: #0: 00000000885eb7ef (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4442 2 locks held by kworker/u4:5/2751: #0: 00000000ec5f14ae ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 000000009b01440e ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 1 lock held by in:imklog/5589: 2 locks held by syz-executor.2/5898: #0: 00000000dc6eb6e7 (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 00000000dc6eb6e7 (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 000000007e645351 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 000000007e645351 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.3/5899: #0: 00000000f9ecc1a6 (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 00000000f9ecc1a6 (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 000000005f2e26e7 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 000000005f2e26e7 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.0/5901: #0: 000000006a77d6bc (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 000000006a77d6bc (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 000000007ff87674 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 000000007ff87674 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.4/5903: #0: 000000000e9a05a3 (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 000000000e9a05a3 (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 00000000af4e192c (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000af4e192c (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.5/5905: #0: 000000007da3886f (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 000000007da3886f (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 0000000052c5c313 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000052c5c313 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by syz-executor.1/5906: #0: 000000006fc3474f (&type->s_umount_key#50){+.+.}, at: deactivate_super fs/super.c:359 [inline] #0: 000000006fc3474f (&type->s_umount_key#50){+.+.}, at: deactivate_super+0x137/0x160 fs/super.c:356 #1: 000000006773b2ee (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 000000006773b2ee (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x16a/0x8e0 fs/fs-writeback.c:2477 2 locks held by kworker/u4:6/6686: #0: 00000000ec5f14ae ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 000000008a452cc9 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 2 locks held by kworker/u4:7/7281: #0: 00000000ec5f14ae ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 000000003ccc0d6a ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 2 locks held by kworker/u4:8/7456: #0: 00000000ec5f14ae ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x6e8/0x15a0 kernel/workqueue.c:2123 #1: 0000000094c51b98 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x71b/0x15a0 kernel/workqueue.c:2127 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1097 Comm: khungtaskd Not tainted 4.19.182-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: phy8 ieee80211_iface_work RIP: 0010:unwind_next_frame.part.6+0x583/0xa60 arch/x86/kernel/unwind_frame.c:329 Code: fd ff ff 48 3d a4 4d 00 87 0f 83 13 fd ff ff e9 ae fd ff ff 48 89 df e8 3b 89 65 00 e9 c2 fd ff ff 65 48 8b 04 25 40 ee 01 00 <48> 39 f0 74 3f 49 8d 72 c0 4c 89 f7 4c 89 8d 60 ff ff ff 48 89 95 RSP: 0018:ffff8881f52bf068 EFLAGS: 00000246 RAX: ffff8881f52b21c0 RBX: ffff8881f52bf140 RCX: ffff8881f52bf198 RDX: ffff8881f52bf168 RSI: ffff8881f52b21c0 RDI: ffff8881f52bf190 RBP: ffff8881f52bf118 R08: 1ffff1103ea57e32 R09: ffff8881f52bf178 R10: ffff8881f52bf0f0 R11: ffff8881f52bf19f R12: 1ffff1103ea57e12 R13: 0000000000000000 R14: ffff8881f52bf720 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f6600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f07ea881028 CR3: 000000000866d004 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0x35/0x40 arch/x86/kernel/unwind_frame.c:287 __save_stack_trace+0x86/0x100 arch/x86/kernel/stacktrace.c:44 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15d/0x3d0 mm/slab.c:3736 kmalloc include/linux/slab.h:520 [inline] kzalloc include/linux/slab.h:709 [inline] cfg80211_inform_bss_frame_data+0x199/0xc30 net/wireless/scan.c:1255 ieee80211_bss_info_update+0x325/0x16c0 net/mac80211/scan.c:105 ieee80211_rx_bss_info net/mac80211/ibss.c:1125 [inline] ieee80211_rx_mgmt_probe_beacon+0x723/0x14c0 net/mac80211/ibss.c:1607 ieee80211_ibss_rx_queued_mgmt+0x1d4/0x1690 net/mac80211/ibss.c:1634 ieee80211_iface_work+0x4bc/0x6e0 net/mac80211/iface.c:1345 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2152 worker_thread+0x85/0xb60 kernel/workqueue.c:2295 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415