[13272] 0 13272 17634 8459 26 4 0 1000 syz-executor2 [13437] 0 13437 17601 8229 24 3 0 1000 syz-executor2 [13440] 0 13440 17634 8231 24 3 0 1000 syz-executor2 [13504] 0 13504 17667 8460 26 4 0 0 syz-executor1 INFO: task syz-executor5:28261 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 [13512] 0 13512 17667 8460 26 4 0 0 syz-executor1 [13588] 0 13588 17601 8230 24 3 0 0 syz-executor3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [13603] 0 13603 17634 8233 25 3 0 0 syz-executor3 syz-executor5 D30384 28261 1842 0x10000004 Call Trace: [13606] 0 13606 17634 8482 26 4 0 0 syz-executor3 [13618] 0 13618 17634 8477 26 4 0 0 syz-executor3 [13659] 0 13659 17601 8454 25 4 0 0 syz-executor1 schedule+0x92/0x1c0 kernel/sched/core.c:3490 [13733] 0 13733 17700 8462 33 4 0 1000 syz-executor4 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [13930] 0 13930 17700 8466 27 4 0 1000 syz-executor4 [13939] 0 13939 17700 8466 27 4 0 1000 syz-executor4 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0xed5/0x2830 net/packet/af_packet.c:3859 [14041] 0 14041 17634 8234 25 3 0 1000 syz-executor5 [14046] 0 14046 17766 8244 26 3 0 1000 syz-executor5 [14082] 0 14082 17667 8477 25 4 0 1000 syz-executor0 [14183] 0 14183 17634 8478 26 4 0 1000 syz-executor0 [14188] 0 14188 17634 8456 25 4 0 0 syz-executor1 [14283] 0 14283 17601 8231 25 3 0 0 syz-executor2 Showing all locks held in the system: [14287] 0 14287 17700 9268 25 3 0 0 syz-executor2 [14301] 0 14301 17667 8477 25 4 0 1000 syz-executor0 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.?}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by cron/1671: #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 getty/1756: #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 1 lock held by syz-executor0/4231: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 1 lock held by syz-executor0/4320: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 1 lock held by syz-executor0/4456: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 1 lock held by syz-executor3/7620: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 2 locks held by kworker/u4:15/13423: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 1 lock held by syz-executor3/18331: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 1 lock held by syz-executor3/18355: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 1 lock held by syz-executor3/18372: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 1 lock held by syz-executor4/5380: #0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389 2 locks held by kworker/u4:8/12176: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 2 locks held by kworker/u4:9/12178: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085 #1: ((&sub_info->work)){+.+.}, at: [] process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089 1 lock held by syz-executor5/28254: #0: (sk_lock-AF_PACKET){+.+.}, at: [] lock_sock include/net/sock.h:1452 [inline] #0: (sk_lock-AF_PACKET){+.+.}, at: [] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3671 2 locks held by modprobe/28275: #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 [14469] 0 14469 17667 8463 26 4 0 1000 syz-executor4 ============================================= [14498] 0 14498 17601 8221 23 3 0 1000 syz-executor5 [14544] 0 14544 17601 8452 24 4 0 0 syz-executor2 [14636] 0 14636 17634 8456 25 4 0 0 syz-executor2 [14806] 0 14806 17799 8491 33 4 0 0 syz-executor3 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 [14936] 0 14936 17601 8477 25 4 0 0 syz-executor3 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 [14959] 0 14959 17700 10186 28 4 0 1000 syz-executor0 [15048] 0 15048 17634 8231 24 3 0 0 syz-executor2 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 28275 Comm: modprobe Not tainted 4.14.91+ #3 task: ffff8881634d5e00 task.stack: ffff888101318000 RIP: 0010:constant_test_bit arch/x86/include/asm/bitops.h:325 [inline] RIP: 0010:PageUnevictable include/linux/page-flags.h:342 [inline] RIP: 0010:page_lru include/linux/mm_inline.h:118 [inline] RIP: 0010:putback_inactive_pages+0x2fd/0xd50 mm/vmscan.c:1713 RSP: 0000:ffff88810131f218 EFLAGS: 00000046 RAX: 0000000000000028 RBX: ffffea0000333460 RCX: 1ffff1103b52ba50 RDX: 0000000000000000 RSI: ffffffffaa825180 RDI: ffff8881da95d280 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003 R10: ffff8881634d66a8 R11: 0000000000000001 R12: dead000000000100 R13: ffffea0000333440 R14: 0000000000000002 R15: dffffc0000000000 FS: 00007fc0b14c5700(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f80b8f56dd3 CR3: 000000015d2e4006 CR4: 00000000001606a0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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: 0000:0x55d90de3b1a0 RSP: 0001:00007fc0b1098000 EFLAGS: 00215080 Code: 80 3c 38 00 0f 85 80 08 00 00 48 8b 6d 00 4c 89 e8 48 c1 e8 03 48 c1 ed 13 83 e5 01 42 80 3c 38 00 0f 85 56 08 00 00 48 8b 43 e0 <48> c1 e8 3e 48 89 44 24 18 48 8b 04 24 48 83 e8 80 48 89 44 24