Oops: general protection fault, probably for non-canonical address 0xdffffc0000000087: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000438-0x000000000000043f] CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted 6.14.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:jfs_ioc_trim+0x227/0x6b0 fs/jfs/jfs_discard.c:89 Code: 03 2b 48 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 8b b3 ce fe 4c 8b 6d 00 49 8d 9d 38 04 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 6a b3 ce fe 48 8b 1b 4c 89 ff 48 RSP: 0018:ffffc9000d367d50 EFLAGS: 00010206 RAX: 0000000000000087 RBX: 0000000000000438 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffff8880424544a0 R08: ffff88801e22207f R09: 1ffff11003c4440f R10: dffffc0000000000 R11: ffffed1003c44410 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000004 R15: 0000000000000001 FS: 00007f53597086c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffccebf4ff8 CR3: 000000004385c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: jfs_ioctl+0x2cd/0x3e0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f535898d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5359708038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5358ba5fa0 RCX: 00007f535898d169 RDX: 0000200000000080 RSI: 00000000c0185879 RDI: 0000000000000048 RBP: 00007f5358a0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5358ba5fa0 R15: 00007ffccebf5ba8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:jfs_ioc_trim+0x227/0x6b0 fs/jfs/jfs_discard.c:89 Code: 03 2b 48 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 8b b3 ce fe 4c 8b 6d 00 49 8d 9d 38 04 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 6a b3 ce fe 48 8b 1b 4c 89 ff 48 RSP: 0018:ffffc9000d367d50 EFLAGS: 00010206 RAX: 0000000000000087 RBX: 0000000000000438 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffff8880424544a0 R08: ffff88801e22207f R09: 1ffff11003c4440f R10: dffffc0000000000 R11: ffffed1003c44410 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000004 R15: 0000000000000001 FS: 00007f53597086c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffccebf4ff8 CR3: 000000004385c000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 03 2b add (%rbx),%ebp 2: 48 89 e8 mov %rbp,%rax 5: 48 c1 e8 03 shr $0x3,%rax 9: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) e: 74 08 je 0x18 10: 48 89 ef mov %rbp,%rdi 13: e8 8b b3 ce fe call 0xfeceb3a3 18: 4c 8b 6d 00 mov 0x0(%rbp),%r13 1c: 49 8d 9d 38 04 00 00 lea 0x438(%r13),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 6a b3 ce fe call 0xfeceb3a3 39: 48 8b 1b mov (%rbx),%rbx 3c: 4c 89 ff mov %r15,%rdi 3f: 48 rex.W