INFO: task syz-executor541:8049 blocked for more than 143 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D26664 8049 7034 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc2822d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc20 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c R13: 00007f0dc2822d20 R14: 00007f0dc2822d20 R15: 0000000000000000 INFO: task syz-executor541:8065 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D27832 8065 7034 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc27e0d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc40 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 00007f0dc27e0d20 R14: 00007f0dc27e0d20 R15: 0000000000000001 INFO: task syz-executor541:8048 blocked for more than 144 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D27120 8048 7030 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc2822d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc20 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c R13: 00007f0dc2822d20 R14: 00007f0dc2822d20 R15: 0000000000000000 INFO: task syz-executor541:8062 blocked for more than 145 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D26400 8062 7030 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc27bfd18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc58 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc50 R08: 0000000020000140 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc5c R13: 00007f0dc27bfd20 R14: 00007f0dc27bfd20 R15: 0000000000000003 INFO: task syz-executor541:8055 blocked for more than 146 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D26664 8055 7033 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc2822d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc20 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c R13: 00007f0dc2822d20 R14: 00007f0dc2822d20 R15: 0000000000000000 INFO: task syz-executor541:8070 blocked for more than 146 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D27832 8070 7033 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc27e0d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc40 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 00007f0dc27e0d20 R14: 00007f0dc27e0d20 R15: 0000000000000001 INFO: task syz-executor541:8081 blocked for more than 147 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D27120 8081 7032 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc2822d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc20 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc2c R13: 00007f0dc2822d20 R14: 00007f0dc2822d20 R15: 0000000000000000 INFO: task syz-executor541:8083 blocked for more than 148 seconds. Not tainted 5.7.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor541 D27832 8083 7032 0x00004004 Call Trace: schedule+0xd0/0x2a0 kernel/sched/core.c:4163 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1874 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __flush_work+0x4fd/0xa80 kernel/workqueue.c:3045 p9_mux_poll_stop net/9p/trans_fd.c:175 [inline] p9_conn_destroy net/9p/trans_fd.c:862 [inline] p9_fd_close+0x290/0x520 net/9p/trans_fd.c:898 p9_client_create+0x99b/0x1440 net/9p/client.c:1069 v9fs_session_init+0x1e7/0x18c0 fs/9p/v9fs.c:406 v9fs_mount+0x79/0x970 fs/9p/vfs_super.c:124 legacy_get_tree+0x105/0x220 fs/fs_context.c:622 vfs_get_tree+0x89/0x2f0 fs/super.c:1547 do_new_mount fs/namespace.c:2816 [inline] do_mount+0x1306/0x1b30 fs/namespace.c:3141 __do_sys_mount fs/namespace.c:3350 [inline] __se_sys_mount fs/namespace.c:3327 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x446ee9 Code: Bad RIP value. RSP: 002b:00007f0dc27e0d18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000006dcc48 RCX: 0000000000446ee9 RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00000000006dcc40 R08: 0000000020000140 R09: 65732f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc4c R13: 00007f0dc27e0d20 R14: 00007f0dc27e0d20 R15: 0000000000000001 Showing all locks held in the system: 3 locks held by kworker/1:0/17: 1 lock held by khungtaskd/1132: #0: ffffffff899bed00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5754 3 locks held by kworker/0:8/3866: 1 lock held by in:imklog/6715: #0: ffff8880a45d0af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1132 Comm: khungtaskd Not tainted 5.7.0-rc1-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events p9_read_work RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:153 [inline] RIP: 0010:write_comp_data+0x9/0x70 kernel/kcov.c:208 Code: 80 dc 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 65 4c 8b 04 25 00 1f 02 00 <65> 8b 05 68 ea 8e 7e a9 00 01 1f 00 75 51 41 8b 80 d8 13 00 00 83 RSP: 0018:ffffc90000d8f998 EFLAGS: 00000246 RAX: ffff8880a9642480 RBX: ffff8880a298f900 RCX: ffffffff85fc4fa5 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 0000000000000000 R08: ffff8880a9642480 R09: ffffed1014531c7c R10: ffffc90000d8fb28 R11: ffffed1014531c7b R12: ffff8880a298fa00 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f203eed9000 CR3: 000000009f650000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: calc_src_frames+0xa5/0x1b0 sound/core/oss/pcm_plugin.c:227 snd_pcm_plug_read_transfer+0x7f/0x2b0 sound/core/oss/pcm_plugin.c:637 snd_pcm_oss_read2+0x1d0/0x3e0 sound/core/oss/pcm_oss.c:1461 snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1499 [inline] snd_pcm_oss_read+0x415/0x6f0 sound/core/oss/pcm_oss.c:2742 __vfs_read+0x76/0x100 fs/read_write.c:426 vfs_read+0x1f0/0x420 fs/read_write.c:462 kernel_read+0xaf/0x120 fs/read_write.c:441 p9_fd_read net/9p/trans_fd.c:263 [inline] p9_read_work+0x2aa/0xfa0 net/9p/trans_fd.c:298 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352