bisecting fixing commit since cc4c818b2219c58af5f0ca59f3e9f02c48bc0b65 building syzkaller on cdde748628a830b9236db9890a9fea0764bde4fb testing commit cc4c818b2219c58af5f0ca59f3e9f02c48bc0b65 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: a1bb834164b2d6b522303c38486ae327d635f78bcc25d23d49bb16afffeb9d40 all runs: crashed: INFO: task hung in do_exit testing current HEAD 59456c9cc40c8f75b5a7efa0fe1f211d9c6fcaf1 testing commit 59456c9cc40c8f75b5a7efa0fe1f211d9c6fcaf1 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 07f299c69abf78581f2077e710b29657bd0fe3c1f72da2ca3ccace2457849290 all runs: crashed: INFO: task hung in do_exit revisions tested: 2, total time: 38m5.583844642s (build: 22m32.17233254s, test: 14m20.806230533s) the crash still happens on HEAD commit msg: Linux 4.19.204 crash: INFO: task hung in do_exit IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 INFO: task syz-executor.2:6777 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28168 6777 5695 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x4610d2 Code: Bad RIP value. RSP: 002b:00007ffcdbc3e148 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffffc RBX: 0000000000020022 RCX: 00000000004610d2 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffcdbc3e310 R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000022000 INFO: task syz-executor.2:6781 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28200 6781 5695 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x461089 Code: Bad RIP value. RSP: 002b:00007f2cfdd65218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000052bf08 RCX: 0000000000461089 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000052bf08 RBP: 000000000052bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000052bf0c R13: 00007ffcdbc3e1bf R14: 00007f2cfdd65300 R15: 0000000000022000 INFO: task syz-executor.3:6780 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28168 6780 5694 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x4610d2 Code: Bad RIP value. RSP: 002b:00007ffe9fdddb78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffffc RBX: 0000000000020022 RCX: 00000000004610d2 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffe9fdddd40 R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000022000 INFO: task syz-executor.3:6782 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28200 6782 5694 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x461089 Code: Bad RIP value. RSP: 002b:00007f3b0049a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000052bf08 RCX: 0000000000461089 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000052bf08 RBP: 000000000052bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000052bf0c R13: 00007ffe9fdddbef R14: 00007f3b0049a300 R15: 0000000000022000 INFO: task syz-executor.0:6796 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28168 6796 5688 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x4610d2 Code: Bad RIP value. RSP: 002b:00007ffff4622a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffffc RBX: 0000000000020022 RCX: 00000000004610d2 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffff4622be0 R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000022000 INFO: task syz-executor.0:6797 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28200 6797 5688 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x461089 Code: Bad RIP value. RSP: 002b:00007fee7b6ba218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000052bf08 RCX: 0000000000461089 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000052bf08 RBP: 000000000052bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000052bf0c R13: 00007ffff4622a8f R14: 00007fee7b6ba300 R15: 0000000000022000 INFO: task syz-executor.4:6814 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28168 6814 5689 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x4610d2 Code: Bad RIP value. RSP: 002b:00007ffe7c1c3aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: fffffffffffffffc RBX: 0000000000020022 RCX: 00000000004610d2 RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffe7c1c3c70 R13: 0000000000000006 R14: 0000000000000000 R15: 0000000000022000 INFO: task syz-executor.4:6815 blocked for more than 140 seconds. Not tainted 4.19.204-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28200 6815 5689 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0xdb5/0x1d40 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x21c/0x3e0 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x49/0xb0 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:512 [inline] do_exit+0x5fc/0x2cf0 kernel/exit.c:857 do_group_exit+0xf4/0x2f0 kernel/exit.c:967 get_signal+0x316/0x19e0 kernel/signal.c:2589 do_signal+0x87/0x1960 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x114/0x200 arch/x86/entry/common.c:163 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: 0033:0x461089 Code: Bad RIP value. RSP: 002b:00007f6771a1b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000052bf08 RCX: 0000000000461089 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000052bf08 RBP: 000000000052bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000052bf0c R13: 00007ffe7c1c3b1f R14: 00007f6771a1b300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 00000000eada7c69 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 1 lock held by in:imklog/5364: #0: 0000000059163516 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 1 lock held by syz-executor.2/6777: #0: 00000000996e986b (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000996e986b (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 1 lock held by syz-executor.2/6781: #0: 00000000996e986b (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000996e986b (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 2 locks held by syz-executor.2/6790: 1 lock held by syz-executor.3/6780: #0: 00000000753a01d8 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000753a01d8 (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 1 lock held by syz-executor.3/6782: #0: 00000000753a01d8 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000753a01d8 (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 2 locks held by syz-executor.3/6792: 1 lock held by syz-executor.0/6796: #0: 00000000145fe3bc (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000145fe3bc (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 1 lock held by syz-executor.0/6797: #0: 00000000145fe3bc (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000145fe3bc (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 1 lock held by syz-executor.0/6804: 1 lock held by syz-executor.4/6814: #0: 00000000dbf62aed (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000dbf62aed (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 1 lock held by syz-executor.4/6815: #0: 00000000dbf62aed (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000dbf62aed (&mm->mmap_sem){++++}, at: do_exit+0x5fc/0x2cf0 kernel/exit.c:857 1 lock held by syz-executor.4/6818: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 4.19.204-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+0x123/0x171 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe6/0x120 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: 6804 Comm: syz-executor.0 Not tainted 4.19.204-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:23 [inline] RIP: 0010:preempt_count_equals kernel/sched/core.c:6126 [inline] RIP: 0010:___might_sleep+0x42/0x270 kernel/sched/core.c:6159 Code: fa 0d 00 85 c0 74 0d 80 3d 3a 47 8c 07 00 0f 84 cb 01 00 00 e8 ef f9 0d 00 85 c0 74 0d 80 3d 23 47 8c 07 00 0f 84 78 01 00 00 <65> 8b 1d 07 c3 bf 7e 65 4c 8b 3c 25 40 ee 01 00 49 8d bf 70 03 00 RSP: 0018:ffff8881dbfe7888 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8881dc7301c0 RCX: 0000000000000000 RDX: 1ffffffff1024031 RSI: ffffffff88199b20 RDI: 0000000000000286 RBP: ffff8881dbfe78b0 R08: ffffffff8175527b R09: ffffed103b7c7736 R10: ffff8881dbfe7a98 R11: ffff8881dbe3b9b7 R12: 0000000000000000 R13: ffffffff86eac660 R14: 0000000000000399 R15: ffffffff8175527b FS: 00007fee7b699700(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3969e1e010 CR3: 00000001dc440006 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __might_sleep+0x95/0x190 kernel/sched/core.c:6145 __mutex_lock_common kernel/locking/mutex.c:921 [inline] __mutex_lock+0xc7/0x11a0 kernel/locking/mutex.c:1083 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1098 perf_mmap+0x65b/0x1670 kernel/events/core.c:5713 call_mmap include/linux/fs.h:1826 [inline] mmap_region+0x9c0/0x14c0 mm/mmap.c:1757 do_mmap+0x6b5/0xe90 mm/mmap.c:1530 do_mmap_pgoff include/linux/mm.h:2329 [inline] vm_mmap_pgoff+0x195/0x210 mm/util.c:357 ksys_mmap_pgoff+0x3c6/0x650 mm/mmap.c:1580 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x461089 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fee7b6991a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 000000000052bfa8 RCX: 0000000000461089 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 0000000000000006 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000001011 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f3488 R14: 00000000004b1b06 R15: 00007fee7b6996bc ---------------- Code disassembly (best guess): 0: fa cli 1: 0d 00 85 c0 74 or $0x74c08500,%eax 6: 0d 80 3d 3a 47 or $0x473a3d80,%eax b: 8c 07 mov %es,(%rdi) d: 00 0f add %cl,(%rdi) f: 84 cb test %cl,%bl 11: 01 00 add %eax,(%rax) 13: 00 e8 add %ch,%al 15: ef out %eax,(%dx) 16: f9 stc 17: 0d 00 85 c0 74 or $0x74c08500,%eax 1c: 0d 80 3d 23 47 or $0x47233d80,%eax 21: 8c 07 mov %es,(%rdi) 23: 00 0f add %cl,(%rdi) 25: 84 78 01 test %bh,0x1(%rax) 28: 00 00 add %al,(%rax) * 2a: 65 8b 1d 07 c3 bf 7e mov %gs:0x7ebfc307(%rip),%ebx # 0x7ebfc338 <-- trapping instruction 31: 65 4c 8b 3c 25 40 ee mov %gs:0x1ee40,%r15 38: 01 00 3a: 49 rex.WB 3b: 8d .byte 0x8d 3c: bf .byte 0xbf 3d: 70 03 jo 0x42