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 3 extents in 0ms gfs2: fsid=syz:syz.0: first mount done, others may mount gfs2: fsid=syz:syz.0: found 1 quota changes syz.0.0[5333] bad frame in rt_sigreturn frame:00007f180289a030 ip:7ffc197298c0 sp:7f1801d35fac orax:ffffffffffffffff ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5333 at include/linux/backing-dev.h:254 inode_to_wb include/linux/backing-dev.h:251 [inline] WARNING: CPU: 0 PID: 5333 at include/linux/backing-dev.h:254 folio_account_dirtied mm/page-writeback.c:2743 [inline] WARNING: CPU: 0 PID: 5333 at include/linux/backing-dev.h:254 __folio_mark_dirty+0x907/0xed0 mm/page-writeback.c:2797 Modules linked in: CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-01892-g8f7c8b88bda4 #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:inode_to_wb include/linux/backing-dev.h:251 [inline] RIP: 0010:folio_account_dirtied mm/page-writeback.c:2743 [inline] RIP: 0010:__folio_mark_dirty+0x907/0xed0 mm/page-writeback.c:2797 Code: f9 ff ff e8 1b 9b c4 ff 4c 89 f7 48 8b 34 24 e8 7f 18 38 00 eb 87 e8 08 9b c4 ff 90 0f 0b 90 e9 45 ff ff ff e8 fa 9a c4 ff 90 <0f> 0b 90 e9 40 fb ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 07 f9 RSP: 0018:ffffc9000d246430 EFLAGS: 00010093 RAX: ffffffff81d04336 RBX: 0000000000000000 RCX: ffff88801f9c2440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888031ceccf8 R08: ffffffff81d03e72 R09: 1ffff1100639d99f R10: dffffc0000000000 R11: ffffed100639d9a0 R12: 0000000000000001 R13: ffff888031cecb88 R14: ffffea0000e7b300 R15: 1ffff1100639d99f FS: 00007f180289a6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c1052a580 CR3: 0000000042dc8000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_buffer_dirty+0x2a4/0x520 fs/buffer.c:1201 gfs2_unpin+0x129/0xa60 fs/gfs2/lops.c:111 buf_lo_after_commit+0x14f/0x1a0 fs/gfs2/lops.c:738 lops_after_commit fs/gfs2/lops.h:51 [inline] gfs2_log_flush+0x118d/0x2610 fs/gfs2/log.c:1115 gfs2_inplace_reserve+0x1143/0x39e0 fs/gfs2/rgrp.c:2188 gfs2_iomap_begin_write fs/gfs2/bmap.c:1034 [inline] gfs2_iomap_begin+0x89d/0x13d0 fs/gfs2/bmap.c:1129 iomap_iter+0x691/0xf60 fs/iomap/iter.c:91 iomap_file_buffered_write+0x2ce/0xe50 fs/iomap/buffered-io.c:1038 gfs2_file_buffered_write+0x4b8/0x840 fs/gfs2/file.c:1060 gfs2_file_write_iter+0x915/0xff0 fs/gfs2/file.c:1164 __kernel_write_iter+0x42a/0x940 fs/read_write.c:612 dump_emit_page fs/coredump.c:884 [inline] dump_user_range+0x4f1/0x970 fs/coredump.c:945 elf_core_dump+0x3e85/0x4770 fs/binfmt_elf.c:2127 do_coredump+0x2162/0x2ec0 fs/coredump.c:758 get_signal+0x140b/0x1750 kernel/signal.c:3001 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0003:0x7ffc197298c0 Code: 00 00 00 00 00 00 00 00 00 00 a7 99 72 19 fc 7f 00 00 b0 50 b3 01 18 7f 00 00 01 80 ad fb 00 00 00 00 10 01 00 00 00 00 00 00 <00> 0f 3d 00 00 00 00 00 90 e9 5f 01 18 7f 00 00 90 e9 5f 01 18 7f RSP: 0003:00007f1801d35fac EFLAGS: 00040e12 RAX: 0000000000000000 RBX: 000000000b9f46d4 RCX: 00007f1801d35fa0 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000047 R08: 00007f1801d35fa0 R09: 0000000000000000 R10: ffffffff00000d1d R11: 00007f1801cc76e8 R12: 0000000000000047 R13: 000000000ba027b6 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 8: 00 00 add %al,(%rax) a: a7 cmpsl %es:(%rdi),%ds:(%rsi) b: 99 cltd c: 72 19 jb 0x27 e: fc cld f: 7f 00 jg 0x11 11: 00 b0 50 b3 01 18 add %dh,0x1801b350(%rax) 17: 7f 00 jg 0x19 19: 00 01 add %al,(%rcx) 1b: 80 ad fb 00 00 00 00 subb $0x0,0xfb(%rbp) 22: 10 01 adc %al,(%rcx) 24: 00 00 add %al,(%rax) 26: 00 00 add %al,(%rax) 28: 00 00 add %al,(%rax) * 2a: 00 0f add %cl,(%rdi) <-- trapping instruction 2c: 3d 00 00 00 00 cmp $0x0,%eax 31: 00 90 e9 5f 01 18 add %dl,0x18015fe9(%rax) 37: 7f 00 jg 0x39 39: 00 90 e9 5f 01 18 add %dl,0x18015fe9(%rax) 3f: 7f .byte 0x7f