------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [] prepare_to_wait+0x98/0x380 kernel/sched/wait.c:256 WARNING: kernel/sched/core.c:9120 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9120, CPU#0: syz.3.7221/19726 Modules linked in: CPU: 0 UID: 0 PID: 19726 Comm: syz.3.7221 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__might_sleep+0x97/0xc0 kernel/sched/core.c:9120 Code: 8b 94 24 70 18 00 00 48 85 d2 75 14 48 83 c4 08 89 ee 48 89 df 31 d2 5b 5d 41 5c e9 33 fc ff ff 48 8d 3d 0c 2f 50 0f 48 89 d1 <67> 48 0f b9 3a eb db e8 8d 27 a4 00 eb 9f 89 74 24 04 e8 b2 27 a4 RSP: 0018:ffffc90003017538 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: ffffffff8e19255d RCX: ffffffff81e1e178 RDX: ffffffff81e1e178 RSI: 0000000000000001 RDI: ffffffff91256c00 RBP: 0000000000000143 R08: 0000000000000001 R09: 00000000000000b2 R10: 0000000000000200 R11: 0000000000000000 R12: ffff88802920a540 R13: 0000000000000001 R14: ffffffff87b0a080 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888096be8000(0063) knlGS:00000000f547db40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002fb17ff8 CR3: 00000000602a6000 CR4: 0000000000352ef0 Call Trace: might_alloc include/linux/sched/mm.h:323 [inline] slab_pre_alloc_hook mm/slub.c:4537 [inline] slab_alloc_node mm/slub.c:4897 [inline] __kmalloc_cache_noprof+0x3fd/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] _kzalloc_noprof include/linux/slab.h:1309 [inline] spcp8x5_get_msr+0xe9/0x2d0 drivers/usb/serial/spcp8x5.c:197 spcp8x5_carrier_raised+0x75/0xe0 drivers/usb/serial/spcp8x5.c:243 serial_port_carrier_raised+0x8f/0xd0 drivers/usb/serial/usb-serial.c:757 tty_port_carrier_raised drivers/tty/tty_port.c:441 [inline] tty_port_block_til_ready+0x43f/0x910 drivers/tty/tty_port.c:559 tty_port_open+0x19c/0x1f0 drivers/tty/tty_port.c:775 tty_open+0x3dd/0xfa0 drivers/tty/tty_io.c:2137 chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x6ab/0x14d0 fs/open.c:947 vfs_open+0x82/0x3f0 fs/open.c:1052 do_open fs/namei.c:4700 [inline] path_openat+0x2873/0x4280 fs/namei.c:4863 do_file_open+0x20e/0x430 fs/namei.c:4892 do_sys_openat2+0x10f/0x1e0 fs/open.c:1368 do_sys_open fs/open.c:1374 [inline] __do_compat_sys_openat fs/open.c:1436 [inline] __se_compat_sys_openat fs/open.c:1434 [inline] __ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1434 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe7/0x970 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf708efec Code: Unable to access opcode bytes at 0xf708efc2. RSP: 002b:00000000f547d50c EFLAGS: 00000292 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 0000000080000700 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 8b 94 24 70 18 00 00 mov 0x1870(%rsp),%edx 7: 48 85 d2 test %rdx,%rdx a: 75 14 jne 0x20 c: 48 83 c4 08 add $0x8,%rsp 10: 89 ee mov %ebp,%esi 12: 48 89 df mov %rbx,%rdi 15: 31 d2 xor %edx,%edx 17: 5b pop %rbx 18: 5d pop %rbp 19: 41 5c pop %r12 1b: e9 33 fc ff ff jmp 0xfffffc53 20: 48 8d 3d 0c 2f 50 0f lea 0xf502f0c(%rip),%rdi # 0xf502f33 27: 48 89 d1 mov %rdx,%rcx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: eb db jmp 0xc 31: e8 8d 27 a4 00 call 0xa427c3 36: eb 9f jmp 0xffffffd7 38: 89 74 24 04 mov %esi,0x4(%rsp) 3c: e8 .byte 0xe8 3d: b2 27 mov $0x27,%dl 3f: a4 movsb %ds:(%rsi),%es:(%rdi)