Hao Sun <sunhao.th@xxxxxxxxx> 于2021年9月20日周一 下午9:05写道： > > Hello, > > When using Healer to fuzz the latest Linux kernel, the following crash > was triggered. > > HEAD commit: 4357f03d6611 Merge tag 'pm-5.15-rc2 > git tree: upstream > console output: > https://drive.google.com/file/d/1gXBYGICW_aFSK8X-6NYECS6iIfHI66Nw/view?usp=sharing > kernel config: https://drive.google.com/file/d/1HKZtF_s3l6PL3OoQbNq_ei9CdBus-Tz0/view?usp=sharing > > Sorry, I don't have a reproducer for this crash, hope the symbolized > report can help. > If you fix this issue, please add the following tag to the commit: > Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> > > INFO: task syz-executor:31998 blocked for more than 143 seconds. > Not tainted 5.15.0-rc1+ #19 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor state:D stack:11144 pid:31998 ppid: 1 flags:0x00004004 > Call Trace: > context_switch kernel/sched/core.c:4940 [inline] > __schedule+0x323/0xae0 kernel/sched/core.c:6287 > schedule+0x36/0xe0 kernel/sched/core.c:6366 > rwsem_down_write_slowpath kernel/locking/rwsem.c:1107 [inline] > __down_write_common.part.13+0x356/0x7a0 kernel/locking/rwsem.c:1262 > deactivate_super+0x4b/0x80 fs/super.c:365 > cleanup_mnt+0x138/0x1b0 fs/namespace.c:1137 > task_work_run+0x86/0xd0 kernel/task_work.c:164 > tracehook_notify_resume include/linux/tracehook.h:189 [inline] > exit_to_user_mode_loop kernel/entry/common.c:175 [inline] > exit_to_user_mode_prepare+0x271/0x280 kernel/entry/common.c:209 > __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] > syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 > do_syscall_64+0x40/0xb0 arch/x86/entry/common.c:86 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x46c777 > RSP: 002b:00007ffd324c9358 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000046c777 > RDX: 0000000000404e22 RSI: 0000000000000002 RDI: 00007ffd324c9420 > RBP: 00007ffd324c9420 R08: 00000000025e5033 R09: 000000000000000b > R10: 00000000fffffffb R11: 0000000000000246 R12: 00000000004e38c6 > R13: 00007ffd324ca4d0 R14: 00007ffd324ca4cc R15: 0000000000000004 > INFO: task syz-executor:1024 blocked for more than 143 seconds. > Not tainted 5.15.0-rc1+ #19 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor state:D stack:12440 pid: 1024 ppid: 31998 flags:0x00004000 > Call Trace: > context_switch kernel/sched/core.c:4940 [inline] > __schedule+0x323/0xae0 kernel/sched/core.c:6287 > schedule+0x36/0xe0 kernel/sched/core.c:6366 > wait_current_trans+0x122/0x1a0 fs/btrfs/transaction.c:534 > start_transaction+0x3b5/0x970 fs/btrfs/transaction.c:681 > btrfs_attach_transaction_barrier+0x21/0x60 fs/btrfs/transaction.c:837 > btrfs_sync_fs+0x7e/0x430 fs/btrfs/super.c:1401 > sync_fs_one_sb+0x40/0x50 fs/sync.c:81 > iterate_supers+0xa7/0x130 fs/super.c:695 > ksys_sync+0x60/0xc0 fs/sync.c:116 > __do_sys_sync+0xa/0x10 fs/sync.c:125 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x200003ca > RSP: 002b:00007eff022caba8 EFLAGS: 00000a83 ORIG_RAX: 00000000000000a2 > RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00000000200003ca > RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 > RBP: 00000000000000eb R08: 0000000000000005 R09: 0000000000000006 > R10: 0000000000000007 R11: 0000000000000a83 R12: 000000000000000b > R13: 000000000000000c R14: 000000000000000d R15: 00007ffd324ca3a0 > INFO: task syz-executor:1054 blocked for more than 143 seconds. > Not tainted 5.15.0-rc1+ #19 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor state:D stack:12440 pid: 1054 ppid: 31998 flags:0x00004000 > Call Trace: > context_switch kernel/sched/core.c:4940 [inline] > __schedule+0x323/0xae0 kernel/sched/core.c:6287 > schedule+0x36/0xe0 kernel/sched/core.c:6366 > wait_current_trans+0x122/0x1a0 fs/btrfs/transaction.c:534 > start_transaction+0x3b5/0x970 fs/btrfs/transaction.c:681 > btrfs_attach_transaction_barrier+0x21/0x60 fs/btrfs/transaction.c:837 > btrfs_sync_fs+0x7e/0x430 fs/btrfs/super.c:1401 > sync_fs_one_sb+0x40/0x50 fs/sync.c:81 > iterate_supers+0xa7/0x130 fs/super.c:695 > ksys_sync+0x60/0xc0 fs/sync.c:116 > __do_sys_sync+0xa/0x10 fs/sync.c:125 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x200003ca > RSP: 002b:00007eff022caba8 EFLAGS: 00000a83 ORIG_RAX: 00000000000000a2 > RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00000000200003ca > RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 > RBP: 00000000000000eb R08: 0000000000000005 R09: 0000000000000006 > R10: 0000000000000007 R11: 0000000000000a83 R12: 000000000000000b > R13: 000000000000000c R14: 000000000000000d R15: 00007ffd324ca3a0 > INFO: task syz-executor:1654 blocked for more than 143 seconds. > Not tainted 5.15.0-rc1+ #19 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor state:D stack:12488 pid: 1654 ppid: 31998 flags:0x00004000 > Call Trace: > context_switch kernel/sched/core.c:4940 [inline] > __schedule+0x323/0xae0 kernel/sched/core.c:6287 > schedule+0x36/0xe0 kernel/sched/core.c:6366 > rwsem_down_write_slowpath kernel/locking/rwsem.c:1107 [inline] > __down_write_common.part.13+0x356/0x7a0 kernel/locking/rwsem.c:1262 > __btrfs_tree_lock+0x2e/0x1a0 fs/btrfs/locking.c:112 > btrfs_init_new_buffer fs/btrfs/extent-tree.c:4740 [inline] > btrfs_alloc_tree_block+0x19c/0x670 fs/btrfs/extent-tree.c:4818 > __btrfs_cow_block+0x16f/0x820 fs/btrfs/ctree.c:415 > btrfs_cow_block+0x12a/0x300 fs/btrfs/ctree.c:570 > btrfs_search_slot+0x6b0/0xee0 fs/btrfs/ctree.c:1768 > btrfs_update_root+0x6b/0x470 fs/btrfs/root-tree.c:134 > commit_fs_roots+0x151/0x220 fs/btrfs/transaction.c:1373 > btrfs_commit_transaction+0x443/0x1450 fs/btrfs/transaction.c:2265 > btrfs_sync_fs+0x9a/0x430 fs/btrfs/super.c:1426 > sync_fs_one_sb+0x40/0x50 fs/sync.c:81 > iterate_supers+0xa7/0x130 fs/super.c:695 > ksys_sync+0x60/0xc0 fs/sync.c:116 > __do_sys_sync+0xa/0x10 fs/sync.c:125 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x2000030a > RSP: 002b:00007eff022caba8 EFLAGS: 00000a83 ORIG_RAX: 00000000000000a2 > RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 000000002000030a > RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 > RBP: 00000000000000ab R08: 0000000000000005 R09: 0000000000000006 > R10: 0000000000000007 R11: 0000000000000a83 R12: 000000000000000b > R13: 000000000000000c R14: 000000000000000d R15: 00007ffd324ca3a0 > INFO: lockdep is turned off. > NMI backtrace for cpu 3 > CPU: 3 PID: 39 Comm: khungtaskd Not tainted 5.15.0-rc1+ #19 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106 > nmi_cpu_backtrace+0x1e9/0x210 lib/nmi_backtrace.c:105 > nmi_trigger_cpumask_backtrace+0x120/0x180 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] > watchdog+0x4e1/0x980 kernel/hung_task.c:295 > kthread+0x178/0x1b0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Sending NMI from CPU 3 to CPUs 0-2: > NMI backtrace for cpu 2 skipped: idling at native_safe_halt > arch/x86/include/asm/irqflags.h:51 [inline] > NMI backtrace for cpu 2 skipped: idling at arch_safe_halt > arch/x86/include/asm/irqflags.h:89 [inline] > NMI backtrace for cpu 2 skipped: idling at default_idle+0xb/0x10 > arch/x86/kernel/process.c:716 > NMI backtrace for cpu 0 skipped: idling at native_safe_halt > arch/x86/include/asm/irqflags.h:51 [inline] > NMI backtrace for cpu 0 skipped: idling at arch_safe_halt > arch/x86/include/asm/irqflags.h:89 [inline] > NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 > arch/x86/kernel/process.c:716 > NMI backtrace for cpu 1 > CPU: 1 PID: 3015 Comm: systemd-journal Not tainted 5.15.0-rc1+ #19 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 > RIP: 0010:lookup_object lib/debugobjects.c:196 [inline] > RIP: 0010:debug_object_activate+0xdb/0x230 lib/debugobjects.c:663 > Code: 88 4c 89 f7 e8 86 16 fb 01 48 8b 9b 00 81 81 88 48 85 db 74 65 > 4c 3b 63 18 74 20 48 8b 1b ba 01 00 00 00 48 85 db 75 0a eb 52 <48> 8b > 1b 48 85 db 74 4a 83 c2 01 4c 3b 63 18 75 ef 8b 53 10 83 fa > RSP: 0018:ffffc9000087fe20 EFLAGS: 00000087 > RAX: 0000000000000206 RBX: ffff888008c50d98 RCX: 0000000000000000 > RDX: 0000000000000008 RSI: 0000000000000000 RDI: ffffffff888cc108 > RBP: ffffc9000087fe80 R08: 0000000000000001 R09: 0000000000000000 > R10: ffffc9000087fea0 R11: 0000000000000000 R12: ffff88810eb33000 > R13: ffffffff8482f6a0 R14: ffffffff888cc108 R15: ffffffff8736e2d0 > FS: 00007f839bff48c0(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f8396a2c008 CR3: 0000000104716000 CR4: 0000000000750ee0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > PKRU: 55555554 > Call Trace: > debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] > __call_rcu kernel/rcu/tree.c:2971 [inline] > call_rcu+0x2c/0x320 kernel/rcu/tree.c:3067 > task_work_run+0x86/0xd0 kernel/task_work.c:164 > tracehook_notify_resume include/linux/tracehook.h:189 [inline] > exit_to_user_mode_loop kernel/entry/common.c:175 [inline] > exit_to_user_mode_prepare+0x271/0x280 kernel/entry/common.c:209 > __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] > syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 > do_syscall_64+0x40/0xb0 arch/x86/entry/common.c:86 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7f839b58485d > Code: bb 20 00 00 75 10 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 > c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b > 3c 24 48 89 c2 e8 67 f6 ff ff 48 89 d0 48 83 c4 08 48 3d 01 > RSP: 002b:00007ffd9a511330 EFLAGS: 00000293 ORIG_RAX: 0000000000000002 > RAX: fffffffffffffffe RBX: 00007ffd9a511640 RCX: 00007f839b58485d > RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000564967919cd0 > RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff > R10: 0000000000000069 R11: 0000000000000293 R12: 00000000ffffffff > R13: 000056496790e040 R14: 00007ffd9a511600 R15: 0000564967911e80 > ---------------- > Code disassembly (best guess): > 0: 88 4c 89 f7 mov %cl,-0x9(%rcx,%rcx,4) > 4: e8 86 16 fb 01 callq 0x1fb168f > 9: 48 8b 9b 00 81 81 88 mov -0x777e7f00(%rbx),%rbx > 10: 48 85 db test %rbx,%rbx > 13: 74 65 je 0x7a > 15: 4c 3b 63 18 cmp 0x18(%rbx),%r12 > 19: 74 20 je 0x3b > 1b: 48 8b 1b mov (%rbx),%rbx > 1e: ba 01 00 00 00 mov $0x1,%edx > 23: 48 85 db test %rbx,%rbx > 26: 75 0a jne 0x32 > 28: eb 52 jmp 0x7c > * 2a: 48 8b 1b mov (%rbx),%rbx <-- trapping instruction > 2d: 48 85 db test %rbx,%rbx > 30: 74 4a je 0x7c > 32: 83 c2 01 add $0x1,%edx > 35: 4c 3b 63 18 cmp 0x18(%rbx),%r12 > 39: 75 ef jne 0x2a > 3b: 8b 53 10 mov 0x10(%rbx),%edx > 3e: 83 .byte 0x83 > 3f: fa cli Hi, This issue can still be triggered on the latest Linux kernel. HEAD commit: 64570fbc14f8 Linux 5.15-rc5 git tree: upstream console output: https://drive.google.com/file/d/1IhuYkuMmGhbV4djMSLMpKrTr2y8PIec-/view?usp=sharing kerne config: https://drive.google.com/file/d/1em3xgUIMNN_-LUUdySzwN-UDPc3qiiKD/view?usp=sharing INFO: task syz-executor:14246 blocked for more than 143 seconds. Not tainted 5.15.0-rc5 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:24560 pid:14246 ppid: 1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xcd9/0x2530 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_write_slowpath+0x81f/0x1300 kernel/locking/rwsem.c:1107 __down_write_common kernel/locking/rwsem.c:1262 [inline] __down_write_common kernel/locking/rwsem.c:1259 [inline] __down_write kernel/locking/rwsem.c:1271 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1518 deactivate_super fs/super.c:365 [inline] deactivate_super+0xa5/0xd0 fs/super.c:362 cleanup_mnt+0x347/0x4b0 fs/namespace.c:1137 task_work_run+0xe0/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x28d/0x2a0 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb06085c56b RSP: 002b:00007ffe39884938 EFLAGS: 00000207 ORIG_RAX: 0000000000000054 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fb06085c56b RDX: 0000000000010140 RSI: 0000000000000000 RDI: 00007ffe39885b10 RBP: 0000000000000065 R08: 0000000000000000 R09: 000000000000007c R10: 00007fb060962540 R11: 0000000000000207 R12: 00007fb0608d4e46 R13: 00007ffe39885b10 R14: 0000555556623e90 R15: 00007ffe39886bac INFO: task syz-executor:15874 blocked for more than 143 seconds. Not tainted 5.15.0-rc5 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:25408 pid:15874 ppid: 14246 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xcd9/0x2530 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_read_slowpath+0x4ee/0x9d0 kernel/locking/rwsem.c:993 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe4/0x440 kernel/locking/rwsem.c:1466 iterate_supers+0xdb/0x290 fs/super.c:693 ksys_sync+0x86/0x150 fs/sync.c:114 __do_sys_sync+0xa/0x10 fs/sync.c:125 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x2000280a RSP: 002b:00007fb05dd82bb8 EFLAGS: 00000a83 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 000000002000280a RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 RBP: 00000000000000ab R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000007 R11: 0000000000000a83 R12: 000000000000000b R13: 000000000000000c R14: 000000000000000d R15: 00007fb05dd82dc0 INFO: task syz-executor:17598 blocked for more than 143 seconds. Not tainted 5.15.0-rc5 #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:25408 pid:17598 ppid: 14246 flags:0x00000000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xcd9/0x2530 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 rwsem_down_read_slowpath+0x4ee/0x9d0 kernel/locking/rwsem.c:993 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe4/0x440 kernel/locking/rwsem.c:1466 iterate_supers+0xdb/0x290 fs/super.c:693 ksys_sync+0x86/0x150 fs/sync.c:114 __do_sys_sync+0xa/0x10 fs/sync.c:125 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x20002a0a RSP: 002b:00007fb05ddc4bb8 EFLAGS: 00000a83 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 0000000020002a0a RDX: 0000000000004c01 RSI: 0000000000000003 RDI: 0000000000400000 RBP: 00000000000000ab R08: 0000000000000005 R09: 0000000000000006 R10: 0000000000000007 R11: 0000000000000a83 R12: 000000000000000b R13: 000000000000000c R14: 000000000000000d R15: 00007fb05ddc4dc0 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 39 Comm: khungtaskd Not tainted 5.15.0-rc5 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1e1/0x220 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xcc8/0x1010 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1-3: NMI backtrace for cpu 3 CPU: 3 PID: 3023 Comm: systemd-journal Not tainted 5.15.0-rc5 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:__need_reclaim mm/page_alloc.c:4528 [inline] RIP: 0010:__need_reclaim mm/page_alloc.c:4521 [inline] RIP: 0010:fs_reclaim_release+0x6c/0xf0 mm/page_alloc.c:4568 Code: 10 75 6a f6 c7 04 74 4f 65 48 8b 2c 25 40 f0 01 00 48 8d 7d 2c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 67 8b 45 2c 89 da RSP: 0018:ffffc900017cfd00 EFLAGS: 00000213 RAX: dffffc0000000000 RBX: 0000000000000cc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801d47392c RBP: ffff88801d473900 R08: 0000000000000000 R09: fffffbfff1adb0b3 R10: ffffffff8d6d8597 R11: fffffbfff1adb0b2 R12: 0000000000000cc0 R13: 0000000000000cc0 R14: 0000000000000000 R15: ffffffff8d6db588 FS: 00007fd0fa8c68c0(0000) GS:ffff888135d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd0f819e090 CR3: 000000001d673000 CR4: 0000000000350ee0 Call Trace: might_alloc include/linux/sched/mm.h:199 [inline] slab_pre_alloc_hook mm/slab.h:492 [inline] slab_alloc_node mm/slub.c:3120 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc+0x4a/0x340 mm/slub.c:3219 getname_flags fs/namei.c:138 [inline] getname_flags+0xd2/0x5b0 fs/namei.c:128 do_sys_openat2+0x448/0x9a0 fs/open.c:1194 do_sys_open+0xc3/0x140 fs/open.c:1216 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fd0f9e56840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffdbea7bc28 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffdbea7bf30 RCX: 00007fd0f9e56840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055b183b03360 RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055b183af8040 R14: 00007ffdbea7bef0 R15: 000055b183b06790 NMI backtrace for cpu 2 CPU: 2 PID: 7274 Comm: kworker/u8:3 Not tainted 5.15.0-rc5 #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Workqueue: bat_events batadv_nc_worker RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x40 kernel/kcov.c:197 Code: 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 65 48 8b 0c 25 40 f0 01 00 bf 02 00 00 00 48 89 ce 4c 8b 04 24 e8 76 ff ff ff <84> c0 74 20 48 8b 91 20 15 00 00 8b 89 1c 15 00 00 48 8b 02 48 83 RSP: 0018:ffffc900087afcd8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff888031e32a00 RCX: ffff888108be3900 RDX: 0000000000000000 RSI: ffff888108be3900 RDI: 0000000000000002 RBP: ffff888014918c80 R08: ffffffff88d155e4 R09: 00000000000001a9 R10: 0000000000000004 R11: fffffbfff1adb0b2 R12: 0000000000000001 R13: 00000000000001a9 R14: dffffc0000000000 R15: ffff8881161fcd48 FS: 0000000000000000(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556d59e88 CR3: 000000001b967000 CR4: 0000000000350ee0 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:410 [inline] batadv_nc_worker+0xf4/0x770 net/batman-adv/network-coding.c:721 process_one_work+0x9df/0x16d0 kernel/workqueue.c:2297 worker_thread+0x90/0xed0 kernel/workqueue.c:2444 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:716 ---------------- Code disassembly (best guess): 0: 10 75 6a adc %dh,0x6a(%rbp) 3: f6 c7 04 test $0x4,%bh 6: 74 4f je 0x57 8: 65 48 8b 2c 25 40 f0 mov %gs:0x1f040,%rbp f: 01 00 11: 48 8d 7d 2c lea 0x2c(%rbp),%rdi 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx * 2a: 48 89 f8 mov %rdi,%rax <-- trapping instruction 2d: 83 e0 07 and $0x7,%eax 30: 83 c0 03 add $0x3,%eax 33: 38 d0 cmp %dl,%al 35: 7c 04 jl 0x3b 37: 84 d2 test %dl,%dl 39: 75 67 jne 0xa2 3b: 8b 45 2c mov 0x2c(%rbp),%eax 3e: 89 da mov %ebx,%edx%
