syzbot has found a reproducer for the following issue on: HEAD commit: f306b90c69ce Merge tag 'smp-urgent-2021-09-12' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14bc2715300000 kernel config: https://syzkaller.appspot.com/x/.config?x=bb1c2ff5ae428ca6 dashboard link: https://syzkaller.appspot.com/bug?extid=65454c239241d3d647da compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171d8963300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15b9ccdd300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+65454c239241d3d647da@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.120s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.180s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.230s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.290s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.340s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.400s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.450s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae BUG: memory leak unreferenced object 0xffff88811953fa80 (size 192): comm "syz-executor248", pid 6847, jiffies 4294979550 (age 31.500s) hex dump (first 32 bytes): 01 00 00 00 08 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff8162fbb1>] kmalloc_node include/linux/slab.h:609 [inline] [<ffffffff8162fbb1>] kzalloc_node include/linux/slab.h:732 [inline] [<ffffffff8162fbb1>] create_io_worker+0x41/0x1f0 fs/io-wq.c:741 [<ffffffff81630067>] io_wqe_create_worker fs/io-wq.c:267 [inline] [<ffffffff81630067>] io_wqe_enqueue+0x217/0x3a0 fs/io-wq.c:873 [<ffffffff8161e3a4>] io_queue_async_work+0xc4/0x200 fs/io_uring.c:1473 [<ffffffff8162944c>] __io_queue_sqe+0x34c/0x510 fs/io_uring.c:6940 [<ffffffff8162a6e6>] io_queue_sqe fs/io_uring.c:6958 [inline] [<ffffffff8162a6e6>] io_submit_sqe fs/io_uring.c:7134 [inline] [<ffffffff8162a6e6>] io_submit_sqes+0xc36/0x2ec0 fs/io_uring.c:7240 [<ffffffff8162cf6f>] __do_sys_io_uring_enter+0x5ff/0xf80 fs/io_uring.c:9882 [<ffffffff843faa25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline] [<ffffffff843faa25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
