[ 1567] 0 1567 17634 8479 25 4 0 1000 syz-executor5 [ 1831] 0 1831 17667 8465 25 4 0 0 syz-executor4 [ 1832] 0 1832 17601 8237 24 3 0 0 syz-executor4 [ 1846] 0 1846 17667 8241 24 3 0 0 syz-executor4 INFO: task syz-executor3:23424 blocked for more than 140 seconds. [ 1863] 0 1863 17634 8239 24 3 0 0 syz-executor4 Not tainted 4.14.91+ #2 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D28952 23424 29396 0x00000004 [ 1993] 0 1993 5563 368 16 3 0 -1000 udevd Call Trace: [ 2031] 0 2031 17634 8457 26 4 0 0 syz-executor2 [ 2054] 0 2054 17667 8459 26 4 0 0 syz-executor0 [ 2088] 0 2088 17667 8457 24 4 0 0 syz-executor0 schedule+0x92/0x1c0 kernel/sched/core.c:3490 [ 2148] 0 2148 17634 8477 26 4 0 1000 syz-executor5 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [ 2192] 0 2192 17601 8453 25 4 0 1000 syz-executor3 [ 2258] 0 2258 17634 8478 25 4 0 1000 syz-executor1 [ 2259] 0 2259 17601 8459 26 4 0 1000 syz-executor3 [ 2320] 0 2320 17601 8231 25 3 0 0 syz-executor2 [ 2322] 0 2322 17634 8234 26 3 0 0 syz-executor2 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 [ 2415] 0 2415 17601 8460 26 4 0 0 syz-executor4 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x6bb/0x2830 net/packet/af_packet.c:3761 [ 2474] 0 2474 17601 8231 25 3 0 0 syz-executor2 [ 2489] 0 2489 17634 8234 25 3 0 0 syz-executor2 [ 2729] 0 2729 17601 8222 24 3 0 0 syz-executor2 [ 2806] 0 2806 17601 8481 25 4 0 1000 syz-executor1 [ 2860] 0 2860 17634 8475 25 4 0 1000 syz-executor1 [ 3079] 0 3079 17601 8475 25 4 0 1000 syz-executor5 [ 3095] 0 3095 17700 8461 25 4 0 0 syz-executor0 [ 3106] 0 3106 17733 8465 26 4 0 0 syz-executor2 [ 3261] 0 3261 17635 8458 26 4 0 0 syz-executor0 [ 3497] 0 3497 17733 8487 26 4 0 1000 syz-executor5 Showing all locks held in the system: 2 locks held by init/1: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x271/0xb80 arch/x86/mm/fault.c:1354 [ 3514] 0 3514 17700 8460 25 4 0 0 syz-executor0 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 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 rsyslogd/1632: [ 3557] 0 3557 17700 8460 25 4 0 0 syz-executor0 #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/1759: #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 ============================================= [ 3563] 0 3563 17634 8481 26 4 0 1000 syz-executor5 [ 3578] 0 3578 17634 8459 26 4 0 0 syz-executor2 [ 3580] 0 3580 17634 8481 26 4 0 1000 syz-executor5 [ 3656] 0 3656 17799 8661 26 4 0 1000 syz-executor5 [ 3687] 0 3687 17634 8237 24 3 0 0 syz-executor4 NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #2 [ 3749] 0 3749 17601 8231 25 3 0 0 syz-executor2 Call Trace: [ 3783] 0 3783 17733 8239 31 3 0 0 syz-executor2 __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 [ 3823] 0 3823 17601 8229 23 3 0 1000 syz-executor1 [ 3845] 0 3845 17601 8230 24 3 0 0 syz-executor0 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 [ 3876] 0 3876 17634 8477 26 4 0 1000 syz-executor1 [ 4029] 0 4029 17634 8477 25 4 0 1000 syz-executor5 [ 4123] 0 4123 17634 8481 25 4 0 1000 syz-executor1 [ 4146] 0 4146 17634 8457 25 4 0 0 syz-executor0 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 1782 Comm: syz-fuzzer Not tainted 4.14.91+ #2 task: ffff8881ce951780 task.stack: ffff8881cb818000 RIP: 0010:__sanitizer_cov_trace_pc+0x23/0x60 kernel/kcov.c:68 RSP: 0000:ffff8881cb81f210 EFLAGS: 00000046 RAX: ffff8881ce951780 RBX: ffffea00020c4320 RCX: 1ffff1103b52ba50 RDX: 0000000000000000 RSI: ffffffff9d825180 RDI: ffff8881da95d280 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003 R10: ffff8881ce952028 R11: 0000000000000001 R12: ffffffff9d825180 R13: ffffea00020c4300 R14: 0000000000000002 R15: dffffc0000000000 FS: 000000c420089c68(0000) GS:ffff8881db900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ede587317 CR3: 00000001d715a001 CR4: 00000000001606a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __read_once_size include/linux/compiler.h:183 [inline] compound_head include/linux/page-flags.h:147 [inline] PageSwapBacked include/linux/page-flags.h:288 [inline] page_is_file_cache include/linux/mm_inline.h:23 [inline] page_lru_base_type include/linux/mm_inline.h:78 [inline] page_lru include/linux/mm_inline.h:121 [inline] putback_inactive_pages+0x351/0xd50 mm/vmscan.c:1713 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: 0001:0x32 RSP: 186a0:000000c42013dfa8 EFLAGS: c42840f4a0 Code: 00 00 e9 90 ed ff ff 90 65 48 8b 04 25 c0 de 01 00 48 85 c0 74 1a 65 8b 15 bb 51 d1 64 81 e2 00 01 1f 00 75 0b 8b 90 a8 11 00 00 <83> fa 01 74 01 c3 48 c7 c2 00 00 00 81 48 81 ea 00 00 00 9b 48 [ 4150] 0 4150 17634 8457 25 4 0 0 syz-executor0