INFO: task syz-executor101:6052 blocked for more than 140 seconds. Not tainted 4.19.0+ #84 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor101 D23160 6052 5728 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3474 schedule+0xfe/0x460 kernel/sched/core.c:3518 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] __do_page_fault+0xbc9/0xe60 arch/x86/mm/fault.c:1489 do_page_fault+0xf2/0x7e0 arch/x86/mm/fault.c:1520 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1136 RIP: 0033:0x4ab5dd Code: Bad RIP value. RSP: 002b:00007ffd251b8d60 EFLAGS: 00010202 RAX: 00000000004ab700 RBX: 0000000000000001 RCX: 00000000006e0350 RDX: 00000000004073b0 RSI: 0000000000000000 RDI: 00000000004cc9d0 RBP: 00007ffd251b8d80 R08: 000000037ffffa00 R09: 000000037ffffa00 R10: 00007ffd251b8df0 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000006e0340 R14: 0000000000000008 R15: 00000000006dbd4c INFO: task syz-executor101:6053 blocked for more than 140 seconds. Not tainted 4.19.0+ #84 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor101 D23336 6053 5728 0x80000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3474 schedule+0xfe/0x460 kernel/sched/core.c:3518 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:511 [inline] do_exit+0x59c/0x26d0 kernel/exit.c:854 do_group_exit+0x177/0x440 kernel/exit.c:970 get_signal+0x8b0/0x1980 kernel/signal.c:2517 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446569 Code: 63 65 20 69 73 20 65 6d 70 74 79 2c 20 79 6f 75 20 6d 61 79 20 77 61 6e 74 20 74 6f 20 2e 2f 63 6f 6e 66 69 67 75 72 65 20 2d <2d> 65 6e 61 62 6c 65 2d 72 74 69 6e 73 74 0a 00 00 00 00 00 00 00 RSP: 002b:00007f317eab4db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dbc48 RCX: 0000000000446569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48 RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c R13: 00007ffd251b8d5f R14: 00007f317eab59c0 R15: 00000000006dbd4c INFO: task syz-executor101:6054 blocked for more than 140 seconds. Not tainted 4.19.0+ #84 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor101 D23472 6054 5728 0x80000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3474 schedule+0xfe/0x460 kernel/sched/core.c:3518 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:280 [inline] rwsem_down_read_failed+0x371/0x710 kernel/locking/rwsem-xadd.c:297 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x9b/0x120 kernel/locking/rwsem.c:26 exit_mm kernel/exit.c:511 [inline] do_exit+0x59c/0x26d0 kernel/exit.c:854 do_group_exit+0x177/0x440 kernel/exit.c:970 get_signal+0x8b0/0x1980 kernel/signal.c:2517 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446569 Code: 63 65 20 69 73 20 65 6d 70 74 79 2c 20 79 6f 75 20 6d 61 79 20 77 61 6e 74 20 74 6f 20 2e 2f 63 6f 6e 66 69 67 75 72 65 20 2d <2d> 65 6e 61 62 6c 65 2d 72 74 69 6e 73 74 0a 00 00 00 00 00 00 00 RSP: 002b:00007f317ea93db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00000000006dbc58 RCX: 0000000000446569 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc58 RBP: 00000000006dbc50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc5c R13: 00007ffd251b8d5f R14: 00007f317ea949c0 R15: 00000000006dbd4c Showing all locks held in the system: 1 lock held by khungtaskd/982: #0: 00000000af474ed2 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 1 lock held by rsyslogd/5576: #0: 0000000070f108bf (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/5698: #0: 0000000002d4342d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000f04525d3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5699: #0: 000000005f62adb0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000003da5b534 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5700: #0: 000000002ed48914 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c13c7a11 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5701: #0: 00000000d7c9e47a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000493c2373 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5702: #0: 0000000049d332d8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000e4cf0101 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5703: #0: 0000000009032093 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c0758610 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/5704: #0: 000000004c73f434 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000004ab0eb3b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor101/6052: #0: 00000000e10cae85 (&mm->mmap_sem){++++}, at: do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] #0: 00000000e10cae85 (&mm->mmap_sem){++++}, at: __do_page_fault+0xbc9/0xe60 arch/x86/mm/fault.c:1489 1 lock held by syz-executor101/6053: #0: 00000000e10cae85 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:511 [inline] #0: 00000000e10cae85 (&mm->mmap_sem){++++}, at: do_exit+0x59c/0x26d0 kernel/exit.c:854 1 lock held by syz-executor101/6054: #0: 00000000e10cae85 (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:511 [inline] #0: 00000000e10cae85 (&mm->mmap_sem){++++}, at: do_exit+0x59c/0x26d0 kernel/exit.c:854 1 lock held by syz-executor101/6055: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 982 Comm: khungtaskd Not tainted 4.19.0+ #84 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+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.1+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb3e/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6055 Comm: syz-executor101 Not tainted 4.19.0+ #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_is_held include/linux/lockdep.h:339 [inline] RIP: 0010:___might_sleep+0x2bc/0x340 kernel/sched/core.c:6109 Code: 00 48 c7 c7 80 d4 0a 88 c6 05 fd 81 99 08 01 e8 1e f1 0b 00 e9 d4 fd ff ff be ff ff ff ff 48 c7 c7 80 ae 39 89 e8 64 bf 0a 00 <85> c0 0f 84 d1 fd ff ff 48 c7 c2 00 dd 0a 88 be dd 17 00 00 48 c7 RSP: 0018:ffff8801c34b7070 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffff8801c2ea42c0 RCX: 0000000000000000 RDX: 1ffffffff1263f8e RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff8801c34b7100 R08: ffffffff819846fb R09: ffffed00385171fe R10: ffff8801c34b7500 R11: ffff8801c28b8ff7 R12: 1ffff10038696e0f R13: 0000000000000000 R14: ffffffff880b1c00 R15: 000000000000038c FS: 00007f317ea73700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d773e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __might_sleep+0x95/0x190 kernel/sched/core.c:6097 __mutex_lock_common kernel/locking/mutex.c:908 [inline] __mutex_lock+0x138/0x16f0 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 perf_mmap+0x86b/0x1cb0 kernel/events/core.c:5646 call_mmap include/linux/fs.h:1813 [inline] mmap_region+0xe82/0x1cd0 mm/mmap.c:1762 do_mmap+0xa22/0x1230 mm/mmap.c:1535 do_mmap_pgoff include/linux/mm.h:2316 [inline] vm_mmap_pgoff+0x213/0x2c0 mm/util.c:350 ksys_mmap_pgoff+0x4da/0x660 mm/mmap.c:1585 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0xe9/0x1b0 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x446569 Code: e8 2c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f317ea72da8 EFLAGS: 00000216 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00000000006dbc68 RCX: 0000000000446569 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 00000000006dbc60 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000216 R12: 00000000006dbc6c R13: 00007ffd251b8d5f R14: 00007f317ea739c0 R15: 00000000006dbd4c