INFO: task syz-executor0:1555 blocked for more than 140 seconds. Not tainted 4.20.0-rc7+ #158 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D25208 1555 26532 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:757 [inline] vfs_removexattr+0x8a/0x1e0 fs/xattr.c:390 removexattr+0xd3/0x130 fs/xattr.c:690 path_removexattr+0x1b9/0x210 fs/xattr.c:704 __do_sys_removexattr fs/xattr.c:718 [inline] __se_sys_removexattr fs/xattr.c:715 [inline] __x64_sys_removexattr+0x59/0x80 fs/xattr.c:715 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: Bad RIP value. RSP: 002b:00007f733fe3fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000020000140 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f733fe406d4 R13: 00000000004bdf89 R14: 00000000004d6858 R15: 00000000ffffffff INFO: task syz-executor0:1579 blocked for more than 140 seconds. Not tainted 4.20.0-rc7+ #158 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D25208 1579 26532 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write_nested+0xa9/0x130 kernel/locking/rwsem.c:195 inode_lock_nested include/linux/fs.h:792 [inline] filename_create+0x1b2/0x5b0 fs/namei.c:3635 user_path_create fs/namei.c:3693 [inline] do_mkdirat+0xda/0x310 fs/namei.c:3832 __do_sys_mkdirat fs/namei.c:3851 [inline] __se_sys_mkdirat fs/namei.c:3849 [inline] __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3849 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: Bad RIP value. RSP: 002b:00007f733fddcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000011 RBP: 000000000072c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f733fddd6d4 R13: 00000000004c2d1b R14: 00000000004d5010 R15: 00000000ffffffff INFO: task syz-executor0:1580 blocked for more than 140 seconds. Not tainted 4.20.0-rc7+ #158 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D22776 1580 26532 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 __rwsem_down_write_failed_common+0xc9a/0x15e0 kernel/locking/rwsem-xadd.c:577 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:606 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xa5/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:757 [inline] vfs_removexattr+0x8a/0x1e0 fs/xattr.c:390 removexattr+0xd3/0x130 fs/xattr.c:690 path_removexattr+0x1b9/0x210 fs/xattr.c:704 __do_sys_removexattr fs/xattr.c:718 [inline] __se_sys_removexattr fs/xattr.c:715 [inline] __x64_sys_removexattr+0x59/0x80 fs/xattr.c:715 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: Bad RIP value. RSP: 002b:00007f733fdbbc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c5 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000020000580 RDI: 0000000020000140 RBP: 000000000072c220 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f733fdbc6d4 R13: 00000000004bdf89 R14: 00000000004d6858 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1020: #0: 000000004dfc7aff (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4379 1 lock held by rsyslogd/6071: #0: 00000000cc56c832 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/6193: #0: 000000003c5d01be (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000027885df4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6194: #0: 000000006edf8250 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000e2bb810b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6195: #0: 000000007d8a86b8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000055052d98 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6196: #0: 0000000050f9eaa3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000e4ce5180 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6197: #0: 00000000cfea5be4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000300932f6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6198: #0: 000000005440dbf3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 0000000047767578 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 2 locks held by getty/6199: #0: 00000000fa28b483 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000d2fcd1da (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1e80 drivers/tty/n_tty.c:2154 4 locks held by syz-executor0/1549: 2 locks held by syz-executor0/1555: #0: 000000007f4e7105 (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 000000007f4e7105 (sb_writers#18){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: 0000000026f9c8e0 (&sb->s_type->i_mutex_key#24){++++}, at: inode_lock include/linux/fs.h:757 [inline] #1: 0000000026f9c8e0 (&sb->s_type->i_mutex_key#24){++++}, at: vfs_removexattr+0x8a/0x1e0 fs/xattr.c:390 2 locks held by syz-executor0/1579: #0: 000000007f4e7105 (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 000000007f4e7105 (sb_writers#18){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: 0000000026f9c8e0 (&sb->s_type->i_mutex_key#24/1){+.+.}, at: inode_lock_nested include/linux/fs.h:792 [inline] #1: 0000000026f9c8e0 (&sb->s_type->i_mutex_key#24/1){+.+.}, at: filename_create+0x1b2/0x5b0 fs/namei.c:3635 2 locks held by syz-executor0/1580: #0: 000000007f4e7105 (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1597 [inline] #0: 000000007f4e7105 (sb_writers#18){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 #1: 0000000026f9c8e0 (&sb->s_type->i_mutex_key#24){++++}, at: inode_lock include/linux/fs.h:757 [inline] #1: 0000000026f9c8e0 (&sb->s_type->i_mutex_key#24){++++}, at: vfs_removexattr+0x8a/0x1e0 fs/xattr.c:390 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1020 Comm: khungtaskd Not tainted 4.20.0-rc7+ #158 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+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.684 msecs NMI backtrace for cpu 1 CPU: 1 PID: 1549 Comm: syz-executor0 Not tainted 4.20.0-rc7+ #158 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:100 Code: d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 48 89 e5 48 8b 75 08 <65> 48 8b 04 25 40 ee 01 00 65 8b 15 48 69 82 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8881bf456b30 EFLAGS: 00000202 RAX: 0000000000000002 RBX: 0000000000000001 RCX: ffffffff83933b9a RDX: 0000000000000001 RSI: ffffffff83933ba3 RDI: 0000000000000005 RBP: ffff8881bf456b30 R08: ffff8881ad4743c0 R09: ffffed1037e8ad97 R10: ffffed1037e8ad97 R11: 0000000000000003 R12: 0000000000000001 R13: ffffffff8860d440 R14: ffffffff8860d400 R15: dffffc0000000000 FS: 00007f733fe61700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001854a4000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_preemption_disabled+0x43/0x280 lib/smp_processor_id.c:15 debug_smp_processor_id+0x1c/0x20 lib/smp_processor_id.c:56 rcu_dynticks_curr_cpu_in_eqs+0x69/0x170 kernel/rcu/tree.c:290 rcu_is_watching+0x10/0x30 kernel/rcu/tree.c:906 rcu_read_lock_held+0x87/0xc0 kernel/rcu/update.c:277 xa_entry include/linux/xarray.h:902 [inline] xas_reload include/linux/xarray.h:1250 [inline] find_get_entry+0xc9d/0x1120 mm/filemap.c:1440 pagecache_get_page+0x12f/0xf00 mm/filemap.c:1518 find_or_create_page include/linux/pagemap.h:322 [inline] grow_dev_page fs/buffer.c:947 [inline] grow_buffers fs/buffer.c:1016 [inline] __getblk_slow fs/buffer.c:1043 [inline] __getblk_gfp+0x3aa/0xd50 fs/buffer.c:1320 __bread_gfp+0x2d/0x310 fs/buffer.c:1354 sb_bread include/linux/buffer_head.h:307 [inline] fat_ent_bread+0x173/0x290 fs/fat/fatent.c:107 fat_ent_read_block fs/fat/fatent.c:442 [inline] fat_alloc_clusters+0x8db/0x16f0 fs/fat/fatent.c:490 fat_alloc_new_dir+0x121/0xfc0 fs/fat/dir.c:1146 vfat_mkdir+0x134/0x60b fs/fat/namei_vfat.c:859 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3817 do_mkdirat+0x27a/0x310 fs/namei.c:3840 __do_sys_mkdirat fs/namei.c:3851 [inline] __se_sys_mkdirat fs/namei.c:3849 [inline] __x64_sys_mkdirat+0x76/0xb0 fs/namei.c:3849 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f733fe60c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000009 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f733fe616d4 R13: 00000000004c2d1b R14: 00000000004d5010 R15: 00000000ffffffff