BUG: spinlock bad magic on CPU#0, syz-executor7/3797 lock: 0xffff8801d85dc218, .magic: dead4eac, .owner: /-1, .owner_cpu: -1 CPU: 0 PID: 3797 Comm: syz-executor7 Not tainted 4.9.71-g2506378 #113 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d698faa0 ffffffff81d922b9 ffff8801d85dc218 ffff8801d819c800 ffff8801d698fce8 ffff8801d85dc218 0000000000000001 ffff8801d698fae0 ffffffff81246a9d ffffffff81222bd2 ffff880100000000 ffff880100000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] spin_dump+0x14d/0x280 kernel/locking/spinlock_debug.c:67 [] spin_bug kernel/locking/spinlock_debug.c:75 [inline] [] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] [] do_raw_spin_lock+0x174/0x1e0 kernel/locking/spinlock_debug.c:112 [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline] [] _raw_spin_lock_irqsave+0x56/0x70 kernel/locking/spinlock.c:159 [] prepare_to_wait_event+0x72/0x450 kernel/sched/wait.c:213 [] sg_ioctl+0x24b5/0x2c30 drivers/scsi/sg.c:894 [] vfs_ioctl fs/ioctl.c:43 [inline] [] do_vfs_ioctl+0x1aa/0x1140 fs/ioctl.c:679 [] SYSC_ioctl fs/ioctl.c:694 [inline] [] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685 [] entry_SYSCALL_64_fastpath+0x23/0xc6 binder: BINDER_SET_CONTEXT_MGR already set binder: 3793:3802 ioctl 40046207 0 returned -16 binder: release 3793:3802 transaction 7 in, still active binder: send failed reply for transaction 7 to 3793:3819 binder: undelivered TRANSACTION_COMPLETE binder: undelivered TRANSACTION_ERROR: 29189 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 3829 Comm: syz-executor6 Not tainted 4.9.71-g2506378 #113 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801b2651800 task.stack: ffff8801d7a88000 RIP: 0010:[] [] __read_once_size include/linux/compiler.h:243 [inline] RIP: 0010:[] [] atomic_read arch/x86/include/asm/atomic.h:26 [inline] RIP: 0010:[] [] page_ref_count include/linux/page_ref.h:66 [inline] RIP: 0010:[] [] put_page_testzero include/linux/mm.h:450 [inline] RIP: 0010:[] [] __free_pages+0x21/0x80 mm/page_alloc.c:3903 RSP: 0018:ffff8801d7a8f9b0 EFLAGS: 00010a07 RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff82664deb RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c RBP: ffff8801d7a8f9c0 R08: 0000000048000000 R09: 0000000000001e30 R10: 0000000000002100 R11: ffff8801b2651800 R12: 0000000000000004 R13: 0000000000000020 R14: ffff8801b2642100 R15: dffffc0000000000 FS: 00007f8a1e945700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020842000 CR3: 00000001d9adf000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000001 ffff8801b2642258 ffff8801d7a8fa20 ffffffff82664e11 ffff8801b2642270 ffffed00364c844b ffffed00364c844e ffff8801b2642268 dead4ead00000000 ffff8801b2642240 0000000000000000 0000000000000000 Call Trace: [] sg_remove_scat.isra.19+0x1c1/0x2d0 drivers/scsi/sg.c:1954 [] sg_finish_rem_req+0x2b5/0x340 drivers/scsi/sg.c:1836 [] sg_new_read.isra.20+0x18d/0x3e0 drivers/scsi/sg.c:567 [] sg_read+0x8bd/0x1440 drivers/scsi/sg.c:456 [] do_loop_readv_writev.part.17+0x141/0x1e0 fs/read_write.c:714 [] do_loop_readv_writev fs/read_write.c:880 [inline] [] do_readv_writev+0x520/0x750 fs/read_write.c:874 [] vfs_readv+0x84/0xc0 fs/read_write.c:898 [] do_readv+0xe6/0x250 fs/read_write.c:924 [] SYSC_readv fs/read_write.c:1011 [inline] [] SyS_readv+0x27/0x30 fs/read_write.c:1008 [] entry_SYSCALL_64_fastpath+0x23/0xc6 Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d RIP [] __read_once_size include/linux/compiler.h:243 [inline] RIP [] atomic_read arch/x86/include/asm/atomic.h:26 [inline] RIP [] page_ref_count include/linux/page_ref.h:66 [inline] RIP [] put_page_testzero include/linux/mm.h:450 [inline] RIP [] __free_pages+0x21/0x80 mm/page_alloc.c:3903 RSP ---[ end trace dd665f0c148b6178 ]---