[ 4204] 0 4204 17634 12723 31 3 0 1000 syz-executor0 [ 4265] 0 4265 17634 12723 31 3 0 1000 syz-executor0 [ 4312] 0 4312 17634 12723 31 3 0 1000 syz-executor0 [ 4352] 0 4352 17634 12723 31 3 0 1000 syz-executor0 INFO: task syz-executor0:22626 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 [ 4399] 0 4399 17634 8236 25 3 0 0 syz-executor4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D30384 22626 1829 0x00000004 [ 4401] 0 4401 17634 12723 31 3 0 1000 syz-executor0 Call Trace: [ 4405] 0 4405 17667 8241 26 3 0 0 syz-executor4 schedule+0x92/0x1c0 kernel/sched/core.c:3490 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [ 4424] 0 4424 17601 8455 25 4 0 0 syz-executor4 [ 4432] 0 4432 17634 8459 25 4 0 0 syz-executor4 [ 4448] 0 4448 17634 8484 25 4 0 0 syz-executor1 [ 4452] 0 4452 17634 12723 31 3 0 1000 syz-executor0 [ 4466] 0 4466 17601 8491 25 4 0 0 syz-executor1 [ 4468] 0 4468 17634 8456 25 4 0 0 syz-executor2 [ 4481] 0 4481 17634 8480 25 4 0 0 syz-executor1 [ 4535] 0 4535 17634 12723 31 3 0 1000 syz-executor0 [ 4580] 0 4580 17634 12723 31 3 0 1000 syz-executor0 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 [ 4595] 0 4595 17667 8234 24 3 0 0 syz-executor2 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x4b7/0x2830 net/packet/af_packet.c:3794 [ 4598] 0 4598 17667 8234 24 3 0 0 syz-executor2 Showing all locks held in the system: 1 lock held by khungtaskd/23: [ 4607] 0 4607 17634 12723 31 3 0 0 syz-executor5 #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by rs:main Q:Reg/1615: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by rsyslogd/1617: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by cron/1664: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 [ 4635] 0 4635 17700 12819 31 3 0 0 syz-executor5 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1745: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by syz-executor3/9385: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 ============================================= [ 4650] 0 4650 17634 12723 31 3 0 1000 syz-executor0 [ 4709] 0 4709 17601 8232 24 3 0 0 syz-executor1 [ 4712] 0 4712 17634 8235 24 3 0 0 syz-executor1 [ 4713] 0 4713 17634 8235 24 3 0 0 syz-executor1 [ 4717] 0 4717 17667 8237 24 3 0 0 syz-executor1 [ 4727] 0 4727 17634 12723 31 3 0 0 syz-executor5 [ 4729] 0 4729 17634 12723 31 3 0 1000 syz-executor0 [ 4763] 0 4763 17696 12815 31 3 0 0 syz-executor5 NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #3 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 [ 4789] 0 4789 17634 12723 31 3 0 1000 syz-executor0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1664 Comm: cron Not tainted 4.14.91+ #3 task: ffff8881d44b8000 task.stack: ffff8881d4210000 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:13 [inline] RIP: 0010:lock_acquire+0x1ca/0x380 kernel/locking/lockdep.c:3990 RSP: 0000:ffff8881d42171a8 EFLAGS: 00000003 RAX: 0000000000000001 RBX: 0000000000000046 RCX: 0000000000000000 RDX: ffff8881d44b8000 RSI: 0000000000000000 RDI: ffff8881d44b882c RBP: ffffffff940d3420 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 FS: 00007f27858de7a0(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000404d65 CR3: 00000001d6074001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:244 [inline] rcu_read_lock include/linux/rcupdate.h:631 [inline] page_evictable+0x35/0x1f0 mm/vmscan.c:3969 putback_inactive_pages+0x259/0xd50 mm/vmscan.c:1703 shrink_inactive_list+0x4ae/0x1170 mm/vmscan.c:1833 shrink_list mm/vmscan.c:2175 [inline] shrink_node_memcg+0x5f9/0x1320 mm/vmscan.c:2440 shrink_node+0x2fa/0xbf0 mm/vmscan.c:2632 shrink_zones mm/vmscan.c:2814 [inline] do_try_to_free_pages+0x350/0xd80 mm/vmscan.c:2876 try_to_free_pages+0x20a/0x6c0 mm/vmscan.c:3082 __perform_reclaim mm/page_alloc.c:3593 [inline] __alloc_pages_direct_reclaim mm/page_alloc.c:3614 [inline] __alloc_pages_slowpath mm/page_alloc.c:4001 [inline] __alloc_pages_nodemask+0xac8/0x22e0 mm/page_alloc.c:4210 __alloc_pages include/linux/gfp.h:461 [inline] __alloc_pages_node include/linux/gfp.h:474 [inline] alloc_pages_node include/linux/gfp.h:488 [inline] __page_cache_alloc include/linux/pagemap.h:226 [inline] page_cache_read mm/filemap.c:2286 [inline] filemap_fault+0x900/0x14a0 mm/filemap.c:2470 ext4_filemap_fault+0x84/0xb0 fs/ext4/inode.c:6179 __do_fault+0x80/0x210 mm/memory.c:3194 do_read_fault mm/memory.c:3604 [inline] do_fault mm/memory.c:3730 [inline] handle_pte_fault mm/memory.c:3960 [inline] __handle_mm_fault+0x9a0/0x2640 mm/memory.c:4084 handle_mm_fault+0x2e0/0x6c9 mm/memory.c:4121 __do_page_fault+0x466/0xb80 arch/x86/mm/fault.c:1425 page_fault+0x42/0x50 arch/x86/entry/entry_64.S:1104 RIP: 0001:0x2f RSP: 8505daa4:00007ffcfc0853f0 EFLAGS: 00000000 Code: fd 03 22 6e 0f 85 39 ff ff ff e8 78 46 e0 ff e9 2f ff ff ff 65 8b 05 c6 a6 21 6e 89 c0 48 0f a3 05 b4 c4 63 02 0f 83 18 ff ff ff <4c> 89 54 24 08 65 ff 05 ca 03 22 6e 48 8b 0d 33 12 63 02 48 89