INFO: task syz-executor219:10270 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-executor219 D28536 10270 8092 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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 __do_page_fault+0x97f/0xd60 arch/x86/mm/fault.c:1348 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1205 RIP: 0033:0x7f4a9eed9ce0 Code: Bad RIP value. RSP: 002b:00007ffe24e94648 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000064 RCX: 0000000000000000 RDX: 00007ffe24e94660 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000032 R08: 00007ffe24eaf000 R09: 000000882b22e223 R10: 0008cb1b09a60c4a R11: 0000000000000001 R12: 00007ffe24e946c0 R13: 00007f4a9ef2041c R14: 00007ffe24e946e0 R15: 00007f4a9ee554a0 INFO: task syz-executor219:10271 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-executor219 D28256 10271 8092 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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 exit_mm kernel/exit.c:512 [inline] do_exit+0x6e4/0x2be0 kernel/exit.c:857 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: 0033:0x7f4a9ee98b39 Code: Bad RIP value. RSP: 002b:00007f4a9ee4a318 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f4a9ef20408 RCX: 00007f4a9ee98b39 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4a9ef20408 RBP: 00007f4a9ef20400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a9eeee074 R13: 00007ffe24e9460f R14: 00007f4a9ee4a400 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000000dcc2683 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7827: #0: 00000000a1b9c8c6 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor219/10270: #0: 0000000039b7b832 (&mm->mmap_sem){++++}, at: __do_page_fault+0x97f/0xd60 arch/x86/mm/fault.c:1348 1 lock held by syz-executor219/10271: #0: 0000000039b7b832 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline] #0: 0000000039b7b832 (&mm->mmap_sem){++++}, at: do_exit+0x6e4/0x2be0 kernel/exit.c:857 2 locks held by syz-executor219/10272: ============================================= 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 01/01/2011 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: 10272 Comm: syz-executor219 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__mutex_unlock_slowpath+0xf/0x610 kernel/locking/mutex.c:1203 Code: 66 66 2e 0f 1f 84 00 00 00 00 00 48 be ff ff ff ff ff ff ff 7f e9 31 fc ff ff 90 41 57 48 89 f2 49 89 ff be 01 00 00 00 41 56 <48> 83 c7 60 41 55 41 54 55 53 48 bb 00 00 00 00 00 fc ff df 48 83 RSP: 0018:ffff8880936a7b08 EFLAGS: 00000293 RAX: ffff88809301a600 RBX: 0000000000000000 RCX: ffffffff8178e215 RDX: ffffffff8178e144 RSI: 0000000000000001 RDI: ffff8880aa71d3f0 RBP: ffff8880a2c4a328 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000020395000 R13: ffff8880aa71d3f0 R14: 0000000000000001 R15: ffff8880aa71d3f0 FS: 00007f4a9ee29700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555559b22b8 CR3: 00000000934b2000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: 0033:0x7f4a9ee98b39 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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:00007f4a9ee29308 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f4a9ef20418 RCX: 00007f4a9ee98b39 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020395000 RBP: 00007f4a9ef20410 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 00007f4a9eeee074 R13: 00007ffe24e9460f R14: 00007f4a9ee29400 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 7: 00 00 00 00 b: 48 be ff ff ff ff ff movabs $0x7fffffffffffffff,%rsi 12: ff ff 7f 15: e9 31 fc ff ff jmpq 0xfffffc4b 1a: 90 nop 1b: 41 57 push %r15 1d: 48 89 f2 mov %rsi,%rdx 20: 49 89 ff mov %rdi,%r15 23: be 01 00 00 00 mov $0x1,%esi 28: 41 56 push %r14 * 2a: 48 83 c7 60 add $0x60,%rdi <-- trapping instruction 2e: 41 55 push %r13 30: 41 54 push %r12 32: 55 push %rbp 33: 53 push %rbx 34: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 3b: fc ff df 3e: 48 rex.W 3f: 83 .byte 0x83