[ 7326] 0 7326 17601 8453 25 4 0 1000 syz-executor3 [ 7334] 0 7334 17601 8453 25 4 0 1000 syz-executor3 [ 7359] 0 7359 17601 8471 25 4 0 1000 syz-executor4 [ 7365] 0 7365 17601 8471 25 4 0 1000 syz-executor4 [ 7372] 0 7372 17601 8471 25 4 0 1000 syz-executor4 INFO: task syz-executor5:22976 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D29984 22976 1849 0x00000004 [ 7409] 0 7409 17601 8470 25 4 0 1000 syz-executor4 [ 7415] 0 7415 17601 8470 25 4 0 1000 syz-executor4 Call Trace: [ 7422] 0 7422 17601 8470 25 4 0 1000 syz-executor4 [ 7465] 0 7465 17601 8234 24 3 0 0 syz-executor2 schedule+0x92/0x1c0 kernel/sched/core.c:3490 [ 7468] 0 7468 17634 8236 24 3 0 0 syz-executor2 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [ 7472] 0 7472 17601 8220 23 3 0 1000 syz-executor4 [ 7501] 0 7501 17601 8220 23 3 0 1000 syz-executor4 [ 7547] 0 7547 17601 8230 24 3 0 1000 syz-executor5 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x592/0x2830 net/packet/af_packet.c:3742 [ 7549] 0 7549 17634 8232 24 3 0 1000 syz-executor5 [ 7590] 0 7590 17601 8220 23 3 0 1000 syz-executor4 [ 7604] 0 7604 17634 8461 25 4 0 0 syz-executor2 [ 7679] 0 7679 17601 8470 25 4 0 1000 syz-executor4 [ 7690] 0 7690 17601 8470 25 4 0 1000 syz-executor4 [ 7696] 0 7696 17601 8470 25 4 0 1000 syz-executor4 [ 7706] 0 7706 17601 8470 25 4 0 1000 syz-executor4 [ 7726] 0 7726 17601 8470 25 4 0 1000 syz-executor4 [ 7734] 0 7734 17601 8470 25 4 0 1000 syz-executor4 [ 7905] 0 7905 17667 8468 25 4 0 0 syz-executor2 [ 7970] 0 7970 17667 8465 26 4 0 0 syz-executor2 [ 8012] 0 8012 17601 8456 26 4 0 1000 syz-executor5 [ 8103] 0 8103 17667 8457 25 4 0 1000 syz-executor5 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 [ 8186] 0 8186 17634 8460 25 4 0 0 syz-executor2 2 locks held by rs:main Q:Reg/1627: #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/1629: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 [ 8387] 0 8387 17601 8458 25 4 0 0 syz-executor2 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by cron/1679: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 [ 8561] 0 8561 17634 8460 25 4 0 0 syz-executor2 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 2 locks held by getty/1757: #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 [ 9044] 0 9044 17667 8476 26 4 0 1000 syz-executor4 2 locks held by syz-fuzzer/1800: #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 3 locks held by kworker/1:3/15912: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((addr_chk_work).work){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 #2: (rtnl_mutex){+.+.}, at: [] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4430 2 locks held by syz-executor5/3549: #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 4 locks held by kworker/u4:34/15949: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x136/0x860 net/core/net_namespace.c:449 [ 9051] 0 9051 17667 8475 25 4 0 1000 syz-executor4 #3: (rtnl_mutex){+.+.}, at: [] sit_exit_net+0x80/0x5b0 net/ipv6/sit.c:1866 2 locks held by udevd/21718: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 [ 9100] 0 9100 17667 8474 25 4 0 1000 syz-executor4 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 ============================================= 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 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13262 Comm: syz-fuzzer Not tainted 4.14.91+ #3 task: ffff88814cd9c680 task.stack: ffff88814ccb8000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:compound_head include/linux/page-flags.h:147 [inline] RIP: 0010:page_mapping+0x2d/0x290 mm/util.c:475 RSP: 0000:ffff88814ccbf0c0 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffea00052dc480 RCX: 0000000000000000 RDX: 1ffffd4000a5b894 RSI: ffffea00052dc480 RDI: ffffea00052dc480 RBP: ffffea00052dc480 R08: 0000000000000001 R09: 0000000000000002 R10: ffff88814cd9cf00 R11: 0000000000000001 R12: ffffea00052dc4a0 R13: ffffea00052dc4a0 R14: ffffea00052dc480 R15: dead000000000100 FS: 000000c4305a91e8(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8239f1d16d CR3: 00000001c62ea001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __remove_mapping+0x83/0x560 mm/vmscan.c:678 shrink_page_list+0x1870/0x32b0 mm/vmscan.c:1311 shrink_inactive_list+0x39a/0x1170 mm/vmscan.c:1816 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: 299c7440:0x1 RSP: 305a9180:000000c430673de0 EFLAGS: c4299c74e8 Code: 41 54 55 53 48 89 fb e8 f2 d1 e7 ff 4c 8d 63 20 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 0f 85 10 02 00 00 <48> 8b 6b 20 40 f6 c5 01 0f 85 c7 01 00 00 e8 c0 d1 e7 ff 4c 89