[15588] 0 15588 17601 8484 27 4 0 0 syz-executor3 [15599] 0 15599 17601 8480 26 4 0 0 syz-executor2 [15609] 0 15609 17601 8480 26 4 0 0 syz-executor2 [15631] 0 15631 17634 12666 32 3 0 0 syz-executor1 [15640] 0 15640 17696 12814 33 3 0 0 syz-executor1 INFO: task syz-executor5:19472 blocked for more than 140 seconds. Not tainted 4.14.91+ #3 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [15668] 0 15668 17634 8479 24 4 0 0 syz-executor0 syz-executor5 D30016 19472 1833 0x10000004 [15699] 0 15699 17601 8488 26 4 0 0 syz-executor4 Call Trace: [15712] 0 15712 17601 8487 26 4 0 0 syz-executor4 schedule+0x92/0x1c0 kernel/sched/core.c:3490 [15727] 0 15727 17634 8490 26 4 0 0 syz-executor4 __lock_sock+0x12b/0x220 net/core/sock.c:2237 [15752] 0 15752 17600 8463 24 3 0 0 syz-executor0 [15755] 0 15755 17633 8458 23 3 0 0 syz-executor0 lock_sock_nested+0xe1/0x100 net/core/sock.c:2758 lock_sock include/net/sock.h:1452 [inline] packet_setsockopt+0x395/0x2830 net/packet/af_packet.c:3671 [15760] 0 15760 17601 8480 26 4 0 0 syz-executor2 [15762] 0 15762 17601 8485 25 4 0 0 syz-executor0 [15769] 0 15769 17601 8485 25 4 0 0 syz-executor0 [15804] 0 15804 17601 8480 26 4 0 0 syz-executor2 [15808] 0 15808 17601 8485 25 4 0 0 syz-executor0 [15819] 0 15819 17667 8487 27 4 0 0 syz-executor3 Showing all locks held in the system: [15821] 0 15821 17601 8480 26 4 0 0 syz-executor2 [15835] 0 15835 17601 8480 26 4 0 0 syz-executor2 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 getty/1747: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275 [15894] 0 15894 17634 8460 23 3 0 0 syz-executor0 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 ============================================= [15899] 0 15899 17667 8463 23 3 0 0 syz-executor0 [16016] 0 16016 17601 8480 26 4 0 0 syz-executor2 [16021] 0 16021 17634 8482 26 4 0 0 syz-executor2 NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.91+ #3 [16026] 0 16026 17601 8485 25 4 0 0 syz-executor0 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 [16038] 0 16038 17601 8485 25 4 0 0 syz-executor0 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1662 Comm: cron Not tainted 4.14.91+ #3 task: ffff8881d4481780 task.stack: ffff8881d47a0000 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:60 RSP: 0018:ffff8881d47a6e70 EFLAGS: 00000097 RAX: ffff8881d4481780 RBX: ffffea00074c4760 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffff8881da95d220 RDI: ffffea0007224528 RBP: 0000000000000001 R08: 1ffff1103b52ba59 R09: 000000000000037b R10: ffff8881d4482028 R11: 0000000000000001 R12: ffffea0007224520 R13: ffffea00074c4740 R14: 0000000000000002 R15: dffffc0000000000 FS: 00007fe5bd4e77a0(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000040823b CR3: 00000001d4a50006 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __read_once_size include/linux/compiler.h:183 [inline] atomic_read arch/x86/include/asm/atomic.h:27 [inline] page_ref_count include/linux/page_ref.h:67 [inline] put_page_testzero include/linux/mm.h:473 [inline] putback_inactive_pages+0x520/0xd50 mm/vmscan.c:1721 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+0x3b2/0x6c9 mm/memory.c:4121 __do_page_fault+0x466/0xb80 arch/x86/mm/fault.c:1425 page_fault+0x22/0x50 arch/x86/entry/entry_64.S:1104 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:45 [inline] RIP: 0010:strncpy_from_user+0x113/0x230 lib/strncpy_from_user.c:118 RSP: 0018:ffff8881d47a7c60 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff94800000 RDX: 0000000000000000 RSI: 0000000000000fe4 RDI: ffff8881d4481798 RBP: 0000000000000fe4 R08: 0000000048042000 R09: 0000000000000fe4 R10: 0000000000001100 R11: ffff8880797a42ff R12: 000000000040823b R13: ffff8880797a331c R14: ffffffff9703a868 R15: dffffc0000000000 ? 0xffffffff94800000 getname_flags+0x10d/0x550 fs/namei.c:149 user_path_at_empty+0x2a/0x50 fs/namei.c:2652 user_path_at include/linux/namei.h:57 [inline] vfs_statx+0xe1/0x180 fs/stat.c:185 vfs_stat include/linux/fs.h:3077 [inline] SYSC_newstat fs/stat.c:337 [inline] SyS_newstat+0x96/0x110 fs/stat.c:333 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 Code: 00 48 c7 c7 20 d8 67 96 4c 89 3d fc 1a 71 03 41 bd f4 ff ff ff e8 0c 50 f1 ff 48 c7 05 e6 1a 71 03 00 00 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 51 6b