INFO: task syz-executor.3:4411 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D28648 4411 8194 0x80000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de exit_mm kernel/exit.c:512 [inline] do_exit+0x6e4/0x2be0 kernel/exit.c:857 do_group_exit+0x125/0x310 kernel/exit.c:967 __do_sys_exit_group kernel/exit.c:978 [inline] __se_sys_exit_group kernel/exit.c:976 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:976 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f79768b80d9 Code: Bad RIP value. RSP: 002b:00007ffd7c7e4d58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f79768b80d9 RDX: 00007f7976869f8b RSI: ffffffffffffffb8 RDI: 0000000000000000 RBP: 0000000000000000 R08: 000001177faf7938 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd7c7e4e40 INFO: task syz-executor.3:4416 blocked for more than 140 seconds. ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de Not tainted 4.19.211-syzkaller #0 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27992 4416 8194 0x80000000 ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de schedule+0x8d/0x1b0 kernel/sched/core.c:3561 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de exit_mm kernel/exit.c:512 [inline] do_exit+0x6e4/0x2be0 kernel/exit.c:857 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 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+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f79768b80d9 Code: Bad RIP value. RSP: 002b:00007f7974e2a218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f79769d7f88 RCX: 00007f79768b80d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f79769d7f88 RBP: 00007f79769d7f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f79769d7f8c R13: 00007ffd7c7e4b1f R14: 00007f7974e2a300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:1/23: 1 lock held by khungtaskd/1570: ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de #0: 00000000c2dc0586 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de 1 lock held by in:imklog/7812: #0: 00000000d37882da (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 3 locks held by syz-executor.1/8167: #0: 00000000c8b3c48d (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000c8b3c48d (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de #1: 00000000c2dc0586 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #1: 00000000c2dc0586 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 ax25_connect(): syz-executor.3 uses autobind, please contact jreuter@yaina.de #2: 00000000c2dc0586 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:428 [inline] #2: 00000000c2dc0586 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 kernel/sched/fair.c:857 1 lock held by syz-executor.3/4411: #0: 00000000a2cdd6d2 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000a2cdd6d2 (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de 1 lock held by syz-executor.3/4416: #0: 00000000a2cdd6d2 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000a2cdd6d2 (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 2 locks held by syz-executor.3/4417: 1 lock held by syz-executor.5/6108: #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de 1 lock held by syz-executor.5/6110: #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 1 lock held by syz-executor.5/6111: #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de 1 lock held by syz-executor.5/6112: #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 00000000f6b51fad (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 1 lock held by syz-executor.5/6113: 2 locks held by syz-executor.4/8560: #0: 000000007ef7da09 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000007ef7da09 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 ax25_connect(): syz-executor.5 uses autobind, please contact jreuter@yaina.de #1: 00000000085e4f80 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:768 [inline] #1: 00000000085e4f80 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238 2 locks held by syz-executor.2/8572: 2 locks held by syz-executor.5/8596: 3 locks held by syz-executor.0/8609: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 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: 6113 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:lock_release+0x4f/0x8b0 kernel/locking/lockdep.c:3920 Code: b5 41 4c 8d 64 24 18 48 c7 44 24 20 ac 2a b7 89 49 c1 ec 03 48 c7 44 24 28 f0 49 4b 81 49 8d 14 04 65 48 8b 1c 25 c0 df 01 00 <48> 8d bb 84 08 00 00 c7 02 f1 f1 f1 f1 c7 42 04 04 f3 f3 f3 48 89 RSP: 0018:ffff88804badf9b8 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: ffff8880b5290240 RCX: ffffffff8178e215 RDX: ffffed100975bf3a RSI: 0000000000000001 RDI: ffff88809363fa10 RBP: ffff88809363fa10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 1ffff1100975bf3a R13: ffffffff8178e144 R14: 1ffff1100975bf51 R15: ffff88809363f9b0 FS: 00007fe4c710b700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f60102dd988 CR3: 0000000091d71000 CR4: 00000000003406f0 DR0: 0000000000010000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __mutex_unlock_slowpath+0x89/0x610 kernel/locking/mutex.c:1203 perf_mmap+0x684/0x1810 kernel/events/core.c:5726 call_mmap include/linux/fs.h:1826 [inline] mmap_region+0xc94/0x16b0 mm/mmap.c:1757 do_mmap+0x8e8/0x1080 mm/mmap.c:1530 do_mmap_pgoff include/linux/mm.h:2329 [inline] vm_mmap_pgoff+0x197/0x200 mm/util.c:357 ksys_mmap_pgoff+0x298/0x5a0 mm/mmap.c:1580 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe4c8bfc0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe4c710b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007fe4c8d1c1f0 RCX: 00007fe4c8bfc0d9 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 00007fe4c8c57ae9 R08: 000000000000002e R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc14b2ca2f R14: 00007fe4c710b300 R15: 0000000000022000