https://bugzilla.kernel.org/show_bug.cgi?id=213877
--- Comment #2 from James Z ([email protected]) --- [1.] Brief With this patch, memory usage dropped from 1.5G per SMR disk to about 1G. The read/write function works fine on disks with plenty of free space. However, on a near-full disk, read operations cause panic. [2.] A small shell script or example program which triggers the problem [James@DataT01 /mnt/03]$ touch 123 [3.] Kernel Output [51671.050646] BUG: kernel NULL pointer dereference, address: 0000000000000000 [51671.050652] #PF: supervisor read access in kernel mode [51671.050654] #PF: error_code(0x0000) - not-present page [51671.050656] PGD 0 P4D 0 [51671.050660] Oops: 0000 [#1] SMP NOPTI [51671.050663] CPU: 4 PID: 52263 Comm: f2fs_ckpt-8:96 Tainted: G W 5.13.4-200.fc34.x86_64 #1 [51671.050666] Hardware name: Micro-Star International Co., Ltd. MS-7B79/X470 GAMING PRO MAX (MS-7B79), BIOS M.60 06/11/2020 [51671.050668] RIP: 0010:f2fs_issue_discard.isra.0+0x77/0x170 [f2fs] [51671.050700] Code: 00 00 00 8b 40 48 8b bb 5c 04 00 00 41 29 c0 8d 4f ff 44 21 c1 89 c8 f7 d1 83 e1 07 c1 e8 03 48 03 42 18 ba 01 00 00 00 d3 e2 <0f> be 08 41 89 c8 41 09 d0 44 88 00 85 d1 75 07 83 ab 90 04 00 00 [51671.050702] RSP: 0018:ffffbe70c1893ca0 EFLAGS: 00010212 [51671.050705] RAX: 0000000000000000 RBX: ffff9f734424f000 RCX: 0000000000000007 [51671.050707] RDX: 0000000000000080 RSI: 0000000008270001 RDI: 0000000000000200 [51671.050709] RBP: 00000027ffffffd8 R08: 0000000008260000 R09: 0000000000000000 [51671.050711] R10: 000000000003de00 R11: 0000000000000004 R12: 0000000008270001 [51671.050713] R13: 0000000000000000 R14: 0000000008270000 R15: ffff9f7345933840 [51671.050715] FS: 0000000000000000(0000) GS:ffff9f7456900000(0000) knlGS:0000000000000000 [51671.050717] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [51671.050719] CR2: 0000000000000000 CR3: 0000000144932000 CR4: 0000000000350ee0 [51671.050721] Call Trace: [51671.050726] f2fs_clear_prefree_segments+0x439/0x6f0 [f2fs] [51671.050750] ? __raw_callee_save___native_queued_spin_unlock+0x11/0x1e [51671.050756] f2fs_write_checkpoint+0xccf/0x11d0 [f2fs] [51671.050782] __checkpoint_and_complete_reqs+0x78/0x160 [f2fs] [51671.050803] issue_checkpoint_thread+0x38/0xb0 [f2fs] [51671.050823] ? finish_wait+0x80/0x80 [51671.050827] ? __checkpoint_and_complete_reqs+0x160/0x160 [f2fs] [51671.050846] kthread+0x127/0x150 [51671.050850] ? set_kthread_struct+0x40/0x40 [51671.050852] ret_from_fork+0x22/0x30 [51671.050858] Modules linked in: binfmt_misc f2fs nls_utf8 hfsplus hfs crc32_generic lz4hc_compress lz4_compress isofs snd_seq_dummy snd_hrtimer xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp bridge stp llc bonding tls nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security rfkill ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter snd_hda_codec_realtek snd_hda_codec_generic sunrpc ledtrig_audio snd_hda_codec_hdmi intel_rapl_msr intel_rapl_common snd_hda_intel snd_intel_dspcfg vfat edac_mce_amd snd_intel_sdw_acpi fat snd_hda_codec kvm_amd ppdev kvm snd_hda_core snd_hwdep irqbypass rapl snd_seq snd_seq_device pcspkr wmi_bmof k10temp snd_pcm joydev [51671.050910] i2c_piix4 snd_timer snd soundcore parport_pc parport gpio_amdpt gpio_generic acpi_cpufreq zram ip_tables radeon i2c_algo_bit drm_ttm_helper ttm drm_kms_helper cec crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel drm sp5100_tco ixgbe ccp mdio dca r8169 wmi fuse [51671.050932] CR2: 0000000000000000 [51671.050935] ---[ end trace 76f29393379353e4 ]--- [51671.050936] RIP: 0010:f2fs_issue_discard.isra.0+0x77/0x170 [f2fs] [51671.050958] Code: 00 00 00 8b 40 48 8b bb 5c 04 00 00 41 29 c0 8d 4f ff 44 21 c1 89 c8 f7 d1 83 e1 07 c1 e8 03 48 03 42 18 ba 01 00 00 00 d3 e2 <0f> be 08 41 89 c8 41 09 d0 44 88 00 85 d1 75 07 83 ab 90 04 00 00 [51671.050960] RSP: 0018:ffffbe70c1893ca0 EFLAGS: 00010212 [51671.050962] RAX: 0000000000000000 RBX: ffff9f734424f000 RCX: 0000000000000007 [51671.050964] RDX: 0000000000000080 RSI: 0000000008270001 RDI: 0000000000000200 [51671.050966] RBP: 00000027ffffffd8 R08: 0000000008260000 R09: 0000000000000000 [51671.050967] R10: 000000000003de00 R11: 0000000000000004 R12: 0000000008270001 [51671.050969] R13: 0000000000000000 R14: 0000000008270000 R15: ffff9f7345933840 [51671.050971] FS: 0000000000000000(0000) GS:ffff9f7456900000(0000) knlGS:0000000000000000 [51671.050973] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [51671.050974] CR2: 0000000000000000 CR3: 0000000144932000 CR4: 0000000000350ee0 -- You may reply to this email to add a comment. 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