loop0: detected capacity change from 0 to 32768 gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" gfs2: fsid=syz:syz: Now mounting FS (format 1801)... gfs2: fsid=syz:syz.0: journal 0 mapped with 1 extents in 0ms gfs2: fsid=syz:syz.0: first mount done, others may mount loop0: detected capacity change from 32768 to 64 syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=18790, nr_sectors = 62 limit=64 loop0: writeback error on inode 9394, offset 0, sector 18790 syz.0.0: attempt to access beyond end of device loop0: rw=2049, sector=18916, nr_sectors = 66 limit=64 loop0: writeback error on inode 9394, offset 31744, sector 18916 syz.0.0: attempt to access beyond end of device loop0: rw=1, sector=2972, nr_sectors = 12 limit=64 gfs2: fsid=syz:syz.0: Error 10 writing to journal, jid=0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted 6.14.0-rc2-syzkaller-00034-gfebbc555cf0f #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:gfs2_glock_dq+0x4d/0xa60 fs/gfs2/glock.c:1664 Code: fd 4d 8d 65 10 4c 89 e5 48 c1 ed 03 80 7c 1d 00 00 74 08 4c 89 e7 e8 82 c7 18 fe 49 8b 0c 24 4c 8d 79 10 4d 89 fe 49 c1 ee 03 <41> 80 3c 1e 00 74 0e 48 89 cb 4c 89 ff e8 61 c7 18 fe 48 89 d9 48 RSP: 0018:ffffc9000d317c38 EFLAGS: 00010202 RAX: ffffffff840d2124 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffffc9000e122000 RSI: 000000000000002f RDI: 0000000000000030 RBP: 1ffff92001a62fa6 R08: ffff8880531cba3b R09: 1ffff1100a639747 R10: dffffc0000000000 R11: ffffed100a639748 R12: ffffc9000d317d30 R13: ffffc9000d317d20 R14: 0000000000000002 R15: 0000000000000010 FS: 00007f16407556c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000010000 CR3: 000000003ea42000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gfs2_glock_dq_uninit+0x25/0xb0 fs/gfs2/glock.c:1722 gfs2_seek_hole+0x16c/0x240 fs/gfs2/inode.c:2151 gfs2_llseek+0x11e/0x280 fs/gfs2/file.c:79 vfs_llseek fs/read_write.c:382 [inline] ksys_lseek fs/read_write.c:395 [inline] __do_sys_lseek fs/read_write.c:405 [inline] __se_sys_lseek fs/read_write.c:403 [inline] __x64_sys_lseek+0x14c/0x1e0 fs/read_write.c:403 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: 0033:0x7f163f98cde9 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:00007f1640755038 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 RAX: ffffffffffffffda RBX: 00007f163fba5fa0 RCX: 00007f163f98cde9 RDX: 0000000000000004 RSI: 0000000000000005 RDI: 0000000000000007 RBP: 00007f163fa0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f163fba5fa0 R15: 00007ffe16b5d8f8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:gfs2_glock_dq+0x4d/0xa60 fs/gfs2/glock.c:1664 Code: fd 4d 8d 65 10 4c 89 e5 48 c1 ed 03 80 7c 1d 00 00 74 08 4c 89 e7 e8 82 c7 18 fe 49 8b 0c 24 4c 8d 79 10 4d 89 fe 49 c1 ee 03 <41> 80 3c 1e 00 74 0e 48 89 cb 4c 89 ff e8 61 c7 18 fe 48 89 d9 48 RSP: 0018:ffffc9000d317c38 EFLAGS: 00010202 RAX: ffffffff840d2124 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffffc9000e122000 RSI: 000000000000002f RDI: 0000000000000030 RBP: 1ffff92001a62fa6 R08: ffff8880531cba3b R09: 1ffff1100a639747 R10: dffffc0000000000 R11: ffffed100a639748 R12: ffffc9000d317d30 R13: ffffc9000d317d20 R14: 0000000000000002 R15: 0000000000000010 FS: 00007f16407556c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000400000010000 CR3: 000000003ea42000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: fd std 1: 4d 8d 65 10 lea 0x10(%r13),%r12 5: 4c 89 e5 mov %r12,%rbp 8: 48 c1 ed 03 shr $0x3,%rbp c: 80 7c 1d 00 00 cmpb $0x0,0x0(%rbp,%rbx,1) 11: 74 08 je 0x1b 13: 4c 89 e7 mov %r12,%rdi 16: e8 82 c7 18 fe call 0xfe18c79d 1b: 49 8b 0c 24 mov (%r12),%rcx 1f: 4c 8d 79 10 lea 0x10(%rcx),%r15 23: 4d 89 fe mov %r15,%r14 26: 49 c1 ee 03 shr $0x3,%r14 * 2a: 41 80 3c 1e 00 cmpb $0x0,(%r14,%rbx,1) <-- trapping instruction 2f: 74 0e je 0x3f 31: 48 89 cb mov %rcx,%rbx 34: 4c 89 ff mov %r15,%rdi 37: e8 61 c7 18 fe call 0xfe18c79d 3c: 48 89 d9 mov %rbx,%rcx 3f: 48 rex.W