INFO: task syz-executor125:19309 blocked for more than 140 seconds. Not tainted 4.14.267-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor125 D28416 19309 7989 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 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:66 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1123 RIP: 0001:0x7f4c5bd04100 RSP: 5bcfd198:0000000000000000 EFLAGS: 00000000 INFO: task syz-executor125:19313 blocked for more than 140 seconds. Not tainted 4.14.267-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor125 D28920 19313 7989 0x80000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x1e6/0x350 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:66 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:511 [inline] do_exit+0x598/0x2850 kernel/exit.c:855 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f4c5bc76419 RSP: 002b:00007f4c5bc27308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007f4c5bc76419 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4c5bcff4c8 RBP: 00007f4c5bcff4c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c5bcff4c0 R13: 00007f4c5bccc088 R14: 00007f4c5bc27400 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor125/19309: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x7b8/0xad0 arch/x86/mm/fault.c:1378 1 lock held by syz-executor125/19313: #0: (&mm->mmap_sem){++++}, at: [] exit_mm kernel/exit.c:511 [inline] #0: (&mm->mmap_sem){++++}, at: [] do_exit+0x598/0x2850 kernel/exit.c:855 2 locks held by syz-executor125/24541: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x11e/0x1a0 mm/util.c:331 #1: (&anon_vma->rwsem){++++}, at: [] anon_vma_lock_read include/linux/rmap.h:131 [inline] #1: (&anon_vma->rwsem){++++}, at: [] validate_mm+0xd3/0x580 mm/mmap.c:359 2 locks held by syz-executor125/24544: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x11e/0x1a0 mm/util.c:331 #1: (&anon_vma->rwsem){++++}, at: [] anon_vma_lock_read include/linux/rmap.h:131 [inline] #1: (&anon_vma->rwsem){++++}, at: [] validate_mm+0xd3/0x580 mm/mmap.c:359 2 locks held by syz-executor125/24551: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x11e/0x1a0 mm/util.c:331 #1: (&anon_vma->rwsem){++++}, at: [] anon_vma_lock_read include/linux/rmap.h:131 [inline] #1: (&anon_vma->rwsem){++++}, at: [] validate_mm+0xd3/0x580 mm/mmap.c:359 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 24551 Comm: syz-executor125 Not tainted 4.14.267-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880b53a4640 task.stack: ffff888094e80000 RIP: 0010:mem_cgroup_uncharge_list+0x0/0x150 mm/memcontrol.c:5823 RSP: 0018:ffff888094e879a0 EFLAGS: 00000297 RAX: ffff8880b53a4640 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888094e87a18 RBP: ffffea000230a7c0 R08: 1ffff11016c2e434 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffea000230a7dc R14: ffff8880ba431218 R15: dffffc0000000000 FS: 00007f4c5bc27700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe81012d000 CR3: 00000000a2266000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: release_pages+0x819/0xbf0 mm/swap.c:819 pagevec_lru_move_fn+0x1c3/0x250 mm/swap.c:213 __pagevec_lru_add mm/swap.c:904 [inline] lru_add_drain_cpu+0x25a/0x470 mm/swap.c:609 lru_add_drain+0x1b/0x50 mm/swap.c:680 unmap_region+0xb3/0x320 mm/mmap.c:2525 do_munmap+0x527/0xc30 mm/mmap.c:2743 mmap_region+0x217/0x1220 mm/mmap.c:1658 do_mmap+0x5b3/0xcb0 mm/mmap.c:1495 do_mmap_pgoff include/linux/mm.h:2185 [inline] vm_mmap_pgoff+0x14e/0x1a0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1545 [inline] SyS_mmap_pgoff+0x249/0x510 mm/mmap.c:1503 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f4c5bc76419 RSP: 002b:00007f4c5bc272f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 000000000000002e RCX: 00007f4c5bc76419 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020341000 RBP: 00007f4c5bcff4c8 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 00007f4c5bcff4c0 R13: 00007f4c5bccc088 R14: 00007f4c5bc27400 R15: 0000000000022000 Code: 48 01 c3 c7 03 00 00 00 00 c7 43 0c 00 00 00 00 48 83 ec 80 5b 5d 41 5c c3 e8 7d cf fa ff eb a9 66 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 41 57 41 56 41 55 41 54 55 53 48 ---------------- Code disassembly (best guess): 0: 48 01 c3 add %rax,%rbx 3: c7 03 00 00 00 00 movl $0x0,(%rbx) 9: c7 43 0c 00 00 00 00 movl $0x0,0xc(%rbx) 10: 48 83 ec 80 sub $0xffffffffffffff80,%rsp 14: 5b pop %rbx 15: 5d pop %rbp 16: 41 5c pop %r12 18: c3 retq 19: e8 7d cf fa ff callq 0xfffacf9b 1e: eb a9 jmp 0xffffffc9 20: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 27: 00 00 00 00 * 2b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 32: fc ff df 35: 41 57 push %r15 37: 41 56 push %r14 39: 41 55 push %r13 3b: 41 54 push %r12 3d: 55 push %rbp 3e: 53 push %rbx 3f: 48 rex.W