syzbot has found a reproducer for the following issue on: HEAD commit: 9d004b2f4fea Merge tag 'cxl-for-5.19' of git://git.kernel... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12fe6d23f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d5ef46f0e355ceff dashboard link: https://syzkaller.appspot.com/bug?extid=c56f6371c48cad0420f9 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17c258f5f00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144f1233f00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c56f6371c48cad0420f9@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task kworker/u5:1:3610 blocked for more than 143 seconds. Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u5:1 state:D stack:27304 pid: 3610 ppid: 2 flags:0x00004000 Workqueue: hci9 hci_power_on Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6431 schedule+0xd2/0x1f0 kernel/sched/core.c:6503 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 __flush_work+0x56c/0xb10 kernel/workqueue.c:3075 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3162 hci_dev_close_sync+0x8d/0x1150 net/bluetooth/hci_sync.c:4091 hci_dev_do_close+0x32/0x70 net/bluetooth/hci_core.c:553 hci_power_on+0x1c0/0x630 net/bluetooth/hci_core.c:981 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> INFO: task kworker/u5:3:3617 blocked for more than 144 seconds. Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u5:3 state:D stack:27568 pid: 3617 ppid: 2 flags:0x00004000 Workqueue: hci8 hci_power_on Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6431 schedule+0xd2/0x1f0 kernel/sched/core.c:6503 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 __flush_work+0x56c/0xb10 kernel/workqueue.c:3075 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3162 hci_dev_close_sync+0x8d/0x1150 net/bluetooth/hci_sync.c:4091 hci_dev_do_close+0x32/0x70 net/bluetooth/hci_core.c:553 hci_power_on+0x1c0/0x630 net/bluetooth/hci_core.c:981 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> INFO: task kworker/u5:4:3619 blocked for more than 144 seconds. Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u5:4 state:D stack:27192 pid: 3619 ppid: 2 flags:0x00004000 Workqueue: hci7 hci_power_on Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6431 schedule+0xd2/0x1f0 kernel/sched/core.c:6503 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 __flush_work+0x56c/0xb10 kernel/workqueue.c:3075 __cancel_work_timer+0x3f9/0x570 kernel/workqueue.c:3162 hci_dev_close_sync+0x8d/0x1150 net/bluetooth/hci_sync.c:4091 hci_dev_do_close+0x32/0x70 net/bluetooth/hci_core.c:553 hci_power_on+0x1c0/0x630 net/bluetooth/hci_core.c:981 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> INFO: task syz-executor921:3700 blocked for more than 145 seconds. Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor921 state:D stack:27944 pid: 3700 ppid: 3603 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6431 schedule+0xd2/0x1f0 kernel/sched/core.c:6503 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 flush_workqueue+0x3ed/0x13a0 kernel/workqueue.c:2861 hci_dev_open+0xdb/0x300 net/bluetooth/hci_core.c:526 hci_sock_ioctl+0x62c/0x910 net/bluetooth/hci_sock.c:1027 sock_do_ioctl+0xcc/0x230 net/socket.c:1169 sock_ioctl+0x2f1/0x640 net/socket.c:1286 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 RIP: 0033:0x7f595e7f37e7 RSP: 002b:00007ffc76721138 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f595e7f37e7 RDX: 0000000000000009 RSI: 00000000400448c9 RDI: 0000000000000003 RBP: 0000000000000004 R08: 00007f595e7a0700 R09: 00007f595e7a0700 R10: 00007f595e7a09d0 R11: 0000000000000246 R12: 6c616b7a79732f2e R13: 585858582e72656c R14: 00007ffc76721164 R15: 00007ffc767211a0 </TASK> INFO: task syz-executor921:3701 blocked for more than 145 seconds. Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor921 state:D stack:27944 pid: 3701 ppid: 3603 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6431 schedule+0xd2/0x1f0 kernel/sched/core.c:6503 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 flush_workqueue+0x3ed/0x13a0 kernel/workqueue.c:2861 hci_dev_open+0xdb/0x300 net/bluetooth/hci_core.c:526 hci_sock_ioctl+0x62c/0x910 net/bluetooth/hci_sock.c:1027 sock_do_ioctl+0xcc/0x230 net/socket.c:1169 sock_ioctl+0x2f1/0x640 net/socket.c:1286 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 RIP: 0033:0x7f595e7f37e7 RSP: 002b:00007ffc76721138 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f595e7f37e7 RDX: 0000000000000007 RSI: 00000000400448c9 RDI: 0000000000000003 RBP: 0000000000000004 R08: 00007f595e7a0700 R09: 00007f595e7a0700 R10: 00007f595e7a09d0 R11: 0000000000000246 R12: 6c616b7a79732f2e R13: 585858582e72656c R14: 00007ffc76721164 R15: 00007ffc767211a0 </TASK> INFO: task syz-executor921:3702 blocked for more than 145 seconds. Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor921 state:D stack:26648 pid: 3702 ppid: 3603 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5116 [inline] __schedule+0xa00/0x4b30 kernel/sched/core.c:6431 schedule+0xd2/0x1f0 kernel/sched/core.c:6503 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1911 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common+0x378/0x530 kernel/sched/completion.c:106 flush_workqueue+0x3ed/0x13a0 kernel/workqueue.c:2861 hci_dev_open+0xdb/0x300 net/bluetooth/hci_core.c:526 hci_sock_ioctl+0x62c/0x910 net/bluetooth/hci_sock.c:1027 sock_do_ioctl+0xcc/0x230 net/socket.c:1169 sock_ioctl+0x2f1/0x640 net/socket.c:1286 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 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+0x46/0xb0 RIP: 0033:0x7f595e7f37e7 RSP: 002b:00007ffc76721138 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f595e7f37e7 RDX: 0000000000000008 RSI: 00000000400448c9 RDI: 0000000000000003 RBP: 0000000000000004 R08: 00007f595e7a0700 R09: 00007f595e7a0700 R10: 00007f595e7a09d0 R11: 0000000000000246 R12: 6c616b7a79732f2e R13: 585858582e72656c R14: 00007ffc76721164 R15: 00007ffc767211a0 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8bd86860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491 2 locks held by getty/3285: #0: ffff88814c09b098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002cd62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcea/0x1230 drivers/tty/n_tty.c:2075 2 locks held by sshd/3597: 3 locks held by kworker/u5:1/3610: #0: ffff88807898c138 ((wq_completion)hci9){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88807898c138 ((wq_completion)hci9){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88807898c138 ((wq_completion)hci9){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff88807898c138 ((wq_completion)hci9){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff88807898c138 ((wq_completion)hci9){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff88807898c138 ((wq_completion)hci9){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000302fda8 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff88801a3f9048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x2a/0x70 net/bluetooth/hci_core.c:551 3 locks held by kworker/u5:3/3617: #0: ffff888076411138 ((wq_completion)hci8){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888076411138 ((wq_completion)hci8){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888076411138 ((wq_completion)hci8){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888076411138 ((wq_completion)hci8){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888076411138 ((wq_completion)hci8){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888076411138 ((wq_completion)hci8){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000312fda8 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff88807421d048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x2a/0x70 net/bluetooth/hci_core.c:551 3 locks held by kworker/u5:4/3619: #0: ffff888076414138 ((wq_completion)hci7){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888076414138 ((wq_completion)hci7){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888076414138 ((wq_completion)hci7){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline] #0: ffff888076414138 ((wq_completion)hci7){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline] #0: ffff888076414138 ((wq_completion)hci7){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline] #0: ffff888076414138 ((wq_completion)hci7){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260 #1: ffffc9000315fda8 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264 #2: ffff888074219048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x2a/0x70 net/bluetooth/hci_core.c:551 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __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:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xc22/0xf90 kernel/hung_task.c:378 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3599 Comm: strace-static-x Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x55/0x180 mm/kasan/generic.c:189 Code: 86 05 01 00 00 49 83 e9 01 48 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 ed 03 49 c1 ea 03 48 01 c5 49 01 c2 48 89 e8 <49> 8d 5a 01 48 89 da 48 29 ea 48 83 fa 10 7e 63 41 89 eb 41 83 e3 RSP: 0018:ffffc90002eff9c8 EFLAGS: 00000082 RAX: fffffbfff1b77492 RBX: 0000000000000000 RCX: ffffffff815e5141 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8dbba490 RBP: fffffbfff1b77492 R08: 0000000000000000 R09: ffffffff8dbba497 R10: fffffbfff1b77492 R11: 0000000000000000 R12: ffff8880b9c39ed8 R13: ffff8880b9c39ec0 R14: ffff88802525a298 R15: ffff888025259d80 FS: 0000000000757340(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555566c1608 CR3: 0000000073fd2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] cpumask_test_cpu include/linux/cpumask.h:379 [inline] cpu_online include/linux/cpumask.h:921 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0xa1/0x780 kernel/locking/lockdep.c:5676 prepare_lock_switch kernel/sched/core.c:4860 [inline] context_switch kernel/sched/core.c:5113 [inline] __schedule+0x9cd/0x4b30 kernel/sched/core.c:6431 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6596 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 try_to_wake_up+0xa04/0x1800 kernel/sched/core.c:4201 ptrace_resume+0x27d/0x2d0 kernel/ptrace.c:895 ptrace_request+0x180/0xef0 kernel/ptrace.c:1230 arch_ptrace+0x36/0x510 arch/x86/kernel/ptrace.c:828 __do_sys_ptrace kernel/ptrace.c:1321 [inline] __se_sys_ptrace kernel/ptrace.c:1286 [inline] __x64_sys_ptrace+0x178/0x310 kernel/ptrace.c:1286 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+0x46/0xb0 RIP: 0033:0x4e6c1a Code: Unable to access opcode bytes at RIP 0x4e6bf0. RSP: 002b:00007ffdb7543730 EFLAGS: 00000206 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 00000000007572f8 RCX: 00000000004e6c1a RDX: 0000000000000000 RSI: 0000000000000e2e RDI: 0000000000000018 RBP: 0000000000000018 R08: 0000000000000017 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000759380 R13: 0000000000000000 R14: 000000000000857f R15: 0000000000617180 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.132 msecs ---------------- Code disassembly (best guess): 0: 86 05 01 00 00 49 xchg %al,0x49000001(%rip) # 0x49000007 6: 83 e9 01 sub $0x1,%ecx 9: 48 89 fd mov %rdi,%rbp c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 13: fc ff df 16: 4d 89 ca mov %r9,%r10 19: 48 c1 ed 03 shr $0x3,%rbp 1d: 49 c1 ea 03 shr $0x3,%r10 21: 48 01 c5 add %rax,%rbp 24: 49 01 c2 add %rax,%r10 27: 48 89 e8 mov %rbp,%rax * 2a: 49 8d 5a 01 lea 0x1(%r10),%rbx <-- trapping instruction 2e: 48 89 da mov %rbx,%rdx 31: 48 29 ea sub %rbp,%rdx 34: 48 83 fa 10 cmp $0x10,%rdx 38: 7e 63 jle 0x9d 3a: 41 89 eb mov %ebp,%r11d 3d: 41 rex.B 3e: 83 .byte 0x83 3f: e3 .byte 0xe3
