INFO: task syz-executor.2:16868 can't die for more than 143 seconds. syz-executor.2 D27192 16868 7018 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 xlog_grant_head_wait+0x3a9/0xd10 fs/xfs/xfs_log.c:257 xlog_grant_head_check+0x3c8/0x420 fs/xfs/xfs_log.c:319 xfs_log_reserve+0x347/0xa90 fs/xfs/xfs_log.c:444 xlog_unmount_write+0xcf/0x630 fs/xfs/xfs_log.c:834 xfs_log_unmount_write fs/xfs/xfs_log.c:918 [inline] xfs_log_quiesce+0x357/0x410 fs/xfs/xfs_log.c:949 xfs_log_unmount fs/xfs/xfs_log.c:963 [inline] xfs_log_mount_cancel+0x44/0xe0 fs/xfs/xfs_log.c:761 xfs_mountfs+0x15da/0x1f20 fs/xfs/xfs_mount.c:1018 xfs_fc_fill_super+0x91e/0x12e0 fs/xfs/xfs_super.c:1552 get_tree_bdev+0x421/0x740 fs/super.c:1353 vfs_get_tree+0x89/0x2f0 fs/super.c:1558 do_new_mount fs/namespace.c:2912 [inline] do_mount+0x14f6/0x1e20 fs/namespace.c:3249 __do_sys_mount fs/namespace.c:3459 [inline] __se_sys_mount fs/namespace.c:3436 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3436 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45f5fa Code: Bad RIP value. RSP: 002b:00007f9475cf6a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000050c300 RCX: 000000000045f5fa RDX: 00007f9475cf6ae0 RSI: 0000000020000080 RDI: 00007f9475cf6b00 RBP: 000000000078bf00 R08: 00007f9475cf6b40 R09: 00007f9475cf6ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000c87 R14: 00000000004cec88 R15: 00007f9475cf76d4 INFO: task syz-executor.2:16868 blocked for more than 143 seconds. Not tainted 5.8.0-rc5-next-20200715-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27192 16868 7018 0x00004004 Call Trace: context_switch kernel/sched/core.c:3445 [inline] __schedule+0x8b4/0x1e80 kernel/sched/core.c:4169 schedule+0xd0/0x2a0 kernel/sched/core.c:4244 xlog_grant_head_wait+0x3a9/0xd10 fs/xfs/xfs_log.c:257 xlog_grant_head_check+0x3c8/0x420 fs/xfs/xfs_log.c:319 xfs_log_reserve+0x347/0xa90 fs/xfs/xfs_log.c:444 xlog_unmount_write+0xcf/0x630 fs/xfs/xfs_log.c:834 xfs_log_unmount_write fs/xfs/xfs_log.c:918 [inline] xfs_log_quiesce+0x357/0x410 fs/xfs/xfs_log.c:949 xfs_log_unmount fs/xfs/xfs_log.c:963 [inline] xfs_log_mount_cancel+0x44/0xe0 fs/xfs/xfs_log.c:761 xfs_mountfs+0x15da/0x1f20 fs/xfs/xfs_mount.c:1018 xfs_fc_fill_super+0x91e/0x12e0 fs/xfs/xfs_super.c:1552 get_tree_bdev+0x421/0x740 fs/super.c:1353 vfs_get_tree+0x89/0x2f0 fs/super.c:1558 do_new_mount fs/namespace.c:2912 [inline] do_mount+0x14f6/0x1e20 fs/namespace.c:3249 __do_sys_mount fs/namespace.c:3459 [inline] __se_sys_mount fs/namespace.c:3436 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3436 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45f5fa Code: Bad RIP value. RSP: 002b:00007f9475cf6a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000050c300 RCX: 000000000045f5fa RDX: 00007f9475cf6ae0 RSI: 0000000020000080 RDI: 00007f9475cf6b00 RBP: 000000000078bf00 R08: 00007f9475cf6b40 R09: 00007f9475cf6ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000c87 R14: 00000000004cec88 R15: 00007f9475cf76d4 Showing all locks held in the system: 1 lock held by khungtaskd/1163: #0: ffffffff89c53980 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/6517: #0: ffff8880a8ed5e30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 1 lock held by syz-executor.2/16868: #0: ffff8880a31420e0 (&type->s_umount_key#47/1){+.+.}-{3:3}, at: alloc_super+0x1ba/0xab0 fs/super.c:233 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1163 Comm: khungtaskd Not tainted 5.8.0-rc5-next-20200715-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20324 Comm: syz-executor.5 Not tainted 5.8.0-rc5-next-20200715-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_cmp8+0x4/0x20 kernel/kcov.c:263 Code: 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <48> 89 f2 48 89 fe bf 06 00 00 00 e9 0c ff ff ff 66 90 66 2e 0f 1f RSP: 0018:ffffc900159cfd28 EFLAGS: 00000082 RAX: 0000000000000000 RBX: ffff8880916ca740 RCX: ffffffff813498f6 RDX: ffff88805ea10480 RSI: ffff8881116ca740 RDI: ffff8880916ca740 RBP: ffff8881116ca740 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc900159cfdf8 R14: dffffc0000000000 R15: ffff8880aa203e00 FS: 00007f4ebe0f0700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000eb0f1e9 CR3: 00000000a9271000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __phys_addr+0x26/0x110 arch/x86/mm/physaddr.c:20 virt_to_head_page include/linux/mm.h:848 [inline] ___cache_free+0x43/0x740 mm/slab.c:3439 qlink_free mm/kasan/quarantine.c:149 [inline] qlist_free_all+0x98/0x160 mm/kasan/quarantine.c:168 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:261 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:442 slab_post_alloc_hook mm/slab.h:535 [inline] slab_alloc mm/slab.c:3312 [inline] __do_kmalloc mm/slab.c:3653 [inline] __kmalloc_track_caller+0x16e/0x310 mm/slab.c:3670 memdup_user+0x22/0xd0 mm/util.c:172 strndup_user+0x70/0xe0 mm/util.c:231 copy_mount_string fs/namespace.c:3151 [inline] __do_sys_mount fs/namespace.c:3444 [inline] __se_sys_mount fs/namespace.c:3436 [inline] __x64_sys_mount+0xe6/0x230 fs/namespace.c:3436 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45f5fa Code: Bad RIP value. RSP: 002b:00007f4ebe0efa68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4ebe0f06d4 RCX: 000000000045f5fa RDX: 00007f4ebe0efae0 RSI: 0000000000000000 RDI: 00007f4ebe0efb00 RBP: 000000000078bf00 R08: 00007f4ebe0efb40 R09: 00007f4ebe0efae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000c7c R14: 0000000000000003 R15: 00007f4ebe0f06d4